Biology Concepts and Hormonal Functions
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Questions and Answers

According to Arvind Gupta, what components can DNA, proteins, and cells be compared to respectively?

  • Software, hardware, and factories (correct)
  • Hardware, factories, and software
  • Hardware, software, and factories
  • Software, factories, and hardware
  • Based on the provided text, what is biology primarily described as?

  • A software process (correct)
  • A rigid structure
  • A mechanical system
  • A chemical reaction
  • According to Ray Kurzweil, what is one characteristic of the software running in our bodies?

  • It evolved in a similar era as today.
  • It runs perfectly and efficiently.
  • It is constantly updated with the latest technology.
  • It is outdated. (correct)
  • What is implied about biology's potential impact on significant global issues?

    <p>Biology is the only way to solve those significant problems. (C)</p> Signup and view all the answers

    In what context does the text present the assertion that “‘Impossible’ is not a scientific term”?

    <p>As an encouragement for Biology students to innovate. (D)</p> Signup and view all the answers

    What is the primary function of calcitonin?

    <p>Decreasing calcium levels in the blood. (B)</p> Signup and view all the answers

    Medullary thyroid cancer (MTC) may increase a person's risk of:

    <p>Bone degradation and osteopenia. (B)</p> Signup and view all the answers

    Which hormone opposes the action of calcitonin?

    <p>Parathyroid hormone. (D)</p> Signup and view all the answers

    Which of the following is NOT a function of triiodothyronine?

    <p>Decreasing blood calcium levels. (C)</p> Signup and view all the answers

    What condition is caused by iodine deficiency?

    <p>Simple goitre. (C)</p> Signup and view all the answers

    Which plant hormone is responsible for stimulating both cell elongation and cell division, particularly in dwarf varieties?

    <p>Gibberellin (B)</p> Signup and view all the answers

    Which of the following occurs when tear glands are activated?

    <p>Tear glands are activated. (A)</p> Signup and view all the answers

    What is a symptom of exophthalmic goitre, a condition related to hyperthyroidism?

    <p>Protruding eyes. (B)</p> Signup and view all the answers

    Unlike auxins, which hormone stimulates lateral buds to grow into branches?

    <p>Cytokinin (A)</p> Signup and view all the answers

    Which of the following plant hormones generally opposes the effects of both auxins and gibberellins?

    <p>Abscisic acid (D)</p> Signup and view all the answers

    Thyroxine regulates growth and development by:

    <p>Increasing the rate at which glucose is oxidized. (C)</p> Signup and view all the answers

    What is the primary function of dendrites in a neuron?

    <p>To carry impulses towards the cell body. (A)</p> Signup and view all the answers

    Which hormone stimulates the ripening of fruits?

    <p>Ethylene (C)</p> Signup and view all the answers

    Which of the following describes the state of the urinary bladder under sympathetic nervous system control?

    <p>Muscles relax. (B)</p> Signup and view all the answers

    What is osteopenia?

    <p>A condition in which the rate the body reabsorbs old bone exceeds the rate in which it produces new bone (D)</p> Signup and view all the answers

    What type of hormone is used in rooting powders to promote root formation in plant cuttings?

    <p>Auxin (A)</p> Signup and view all the answers

    What is the basic structural and functional unit of the nervous system responsible for transmitting impulses?

    <p>Neuron (A)</p> Signup and view all the answers

    Which part of the neuron relays impulses it receives from the dendrons to the axon?

    <p>Cell body (soma) (D)</p> Signup and view all the answers

    Which hormone is associated with inducing dormancy in plants and suppressing bud growth?

    <p>Abscisic acid (B)</p> Signup and view all the answers

    Which of the following is a function of gibberellins?

    <p>Increasing resistance to viral infections and low temperatures (A)</p> Signup and view all the answers

    Under parasympathetic nervous system control, what happens to salivary secretion?

    <p>It is increased. (C)</p> Signup and view all the answers

    How do blood vessles on skin react to the stimulation of the sympathetic nervous system?

    <p>Constrict arteries. (C)</p> Signup and view all the answers

    Which hormone controls the opening and closing of stomata?

    <p>Abscisic acid (B)</p> Signup and view all the answers

    Which of the following describes the condition of erector muscles of the skin under sympathetic stimulation?

    <p>Stimulated (hair raised). (D)</p> Signup and view all the answers

    Which physiological response is initiated by the hypothalamus to conserve heat when the body temperature drops below the normal range?

    <p>Shivering to increase cell metabolism and heat production. (A)</p> Signup and view all the answers

    What is the primary function of vasodilation in thermoregulation when the body is overheating?

    <p>To increase blood flow near the skin surface, allowing heat loss through radiation and convection. (D)</p> Signup and view all the answers

    Which part of the brain acts as the body's thermostat, regulating heat-producing and heat-losing processes?

    <p>Hypothalamus (D)</p> Signup and view all the answers

    Which of the following is an example of behavioural regulation in response to cold?

    <p>Closing windows to prevent cold winds from entering. (C)</p> Signup and view all the answers

    During intense physical exercise, the body temperature rises. What is the hypothalamus's immediate response to this overheating?

    <p>It accelerates heat-losing processes and switches off heat-producing ones. (C)</p> Signup and view all the answers

    Besides sweating, which method do other mammals use to lose heat by evaporation?

    <p>Panting (C)</p> Signup and view all the answers

    How does stretching out the limbs while resting in bed help to regulate body temperature when it is hot?

    <p>It increases the surface area exposed to the air, maximizing heat loss. (B)</p> Signup and view all the answers

    Which of these mechanisms is NOT an action of physiological regulation?

    <p>Seeking shade (B)</p> Signup and view all the answers

    What is the function of Chlorine terase in the context of neurotransmission?

    <p>It quickly destroys acetylcholine, preventing its accumulation. (A)</p> Signup and view all the answers

    Why do synapses ensure that impulses travel in one direction only?

    <p>To avoid confusion within the nervous system. (B)</p> Signup and view all the answers

    At which part of the nervous system do drugs like heroin act to affect the body?

    <p>The synapses (A)</p> Signup and view all the answers

    According to the 'all or none' principle, what determines the speed of an impulse?

    <p>The strength and minimum threshold of the stimulus. (A)</p> Signup and view all the answers

    Which characteristic is exclusive to a reflex action when compared to a voluntary action?

    <p>A quick response designed to minimize damage to the body. (B)</p> Signup and view all the answers

    The reflex arc is best described as:

    <p>The series of neurons which impulses pass to bring a response. (A)</p> Signup and view all the answers

    Which of the following actions is NOT usually considered a reflex action?

    <p>Reading (A)</p> Signup and view all the answers

    In a reflex action, what is the role of muscle receptor cells?

    <p>To initiate actions that bypass the brain. (A)</p> Signup and view all the answers

    Flashcards

    Biology as Technology

    Biology is viewed as the most powerful technology for solving global issues.

    DNA as Software

    DNA is described as the software that directs cellular functions.

    Cells as Factories

    Cells function like factories, producing proteins and carrying out processes.

    Evolution and Outdated Software

    Human bodies contain outdated biological software due to evolutionary changes.

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    The term 'Impossible'

    'Impossible' is labeled as unscientific, meaning anything can potentially be accomplished.

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    Physiological regulation

    Automatic body adjustments like sweating and blood flow changes, not controlled by will.

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    Behavioral regulation

    Conscious and subconscious actions taken to maintain comfort, like seeking shade or warmth.

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    Hypothalamus

    The brain region acting as the principal heat-regulating center, similar to a thermostat.

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    Vasodilation

    Expansion of blood capillaries that increases blood flow to the skin surface for heat loss.

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    Sweating

    Process where sweat glands secrete sweat, cooling the body through evaporation.

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    Heat loss processes

    Methods like vasodilation and sweating that the body uses to reduce temperature.

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    Temperature receptors

    Sensors in the hypothalamus that detect body temperature changes and trigger responses.

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    Heat production processes

    Physiological adjustments that generate warmth when the body cools down.

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    Calcitonin

    Hormone that regulates calcium levels in blood by decreasing them.

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    Parathyroid Hormone

    Hormone that increases blood calcium levels, opposing calcitonin.

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    Medullary Thyroid Cancer (MTC)

    Condition that may increase risk of bone degradation and osteopenia.

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    Triiodothyronine (T3)

    Hormone vital for metabolic rate, heart, and muscle functions.

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    Thyroxine (T4)

    Hormone that regulates growth and development in body cells.

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    Hyperthyroidism

    Condition caused by excess thyroid hormones, leading to increased metabolic rate.

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    Hypothyroidism

    Condition resulting from insufficient thyroid hormone, causing decreased metabolism.

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    Goitre

    Swelling of the thyroid gland, often due to iodine deficiency.

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    Synthetic auxins

    Hormones used to seal cut plant areas and induce tissue formation after grafting.

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    Auxins

    Plant hormones that promote root formation and cell elongation.

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    Gibberellins

    Hormones that stimulate cell division, elongation, and germination in plants.

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    Effects of gibberellins

    Induces seed germination, enhances fruit size, and promotes bud growth.

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    Cytokinins

    Hormones that promote cell division and branching in plants, delaying aging.

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    Abscisic acid

    Hormone that inhibits plant growth, induces dormancy, and controls stomata.

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    Ethylene

    A hydrocarbon hormone that stimulates fruit ripening and inhibits bud growth.

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    Applications of plant hormones

    Used in agriculture for propagation, weed control, and enhancing growth.

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    Autonomic Nervous System

    Part of the nervous system that controls involuntary actions like heart rate and digestion.

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    Neuron

    Basic unit of the nervous system, responsible for transmitting impulses.

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    Cell Body (Soma)

    Central part of a neuron containing the nucleus and organelles.

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    Dendrite

    Branch-like structures that receive signals from other neurons.

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    Axon

    Long fiber that transmits impulses away from the neuron's cell body.

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    Impulses

    Electrical signals transmitted through neurons, conveying messages.

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    Nervous System Functions

    Includes control of heart rate, digestion, and movement based on stimuli.

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    Acetylcholine

    A neurochemical that transmits signals across synapses.

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    Chlorine terase

    An enzyme that inactivates acetylcholine in the synaptic gap.

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    Synapse

    The junction where impulses are transmitted from one neuron to another.

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    Impulse Directionality

    Impulses in the nervous system travel in one direction only.

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    Threshold Stimulus

    The minimum strength required to initiate a neural impulse.

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    Reflex Action

    An automatic response to a stimulus without brain involvement.

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    Reflex Arc

    The pathway of neurons involved in a reflex action.

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    Voluntary vs Involuntary Actions

    Voluntary actions are consciously controlled; involuntary are automatic responses.

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    Study Notes

    Year 12 Biology E-Note

    • Biology is the most powerful technology; DNA is software, proteins are hardware, and cells are factories.
    • The world has many trillion-dollar problems, and biology is the only way to solve them.
    • Biology is a software process; trillions of cells make up our bodies, each governed by this process. Current biological software is outdated, having evolved in a different era.
    • "Impossible" is not a scientific term.

    Award Page

    • Students were recognized for academic excellence and practical skills.
    • Awards were given for individual academic performance and practical distinction in Biology.

    2023/2024 Biology Scheme of Work (Term 1)

    • Week 1: Revision from Year 11, Beginning of Term Test, Reproductive System in Plants.
    • Week 2: Regulation of Internal Environment of Organisms (I).
    • Week 3: Regulation of Internal Environment of Organisms (II).
    • Week 4: Plant Hormones.
    • Week 5: Nervous Coordination (I).
    • Week 6: Nervous Coordination (II).
    • Week 7: Peripheral Nervous System.
    • Week 8: Sense Organs / Structure and Functions of Neuron.
    • Week 9: Sense Organs / Reflex and Voluntary Actions.
    • Week 10: Sense Organs / Experiments on Dog, Food, and Bell.
    • Week 11: Revision
    • Week 12: Examination

    Regulation of the Internal Environment (Unit 1)

    • Organs usually find themselves in a constantly changing environment requiring self-regulation (homeostasis).
    • Homeostasis is maintaining internal stability despite external changes.
    • Conditions necessary for proper bodily function: proper chemical concentrations, temperature, pH (acidity), osmotic pressure, etc.

    Kidney as a Structure of Homeostasis

    • The human kidney is bean-shaped, located in the abdomen, with an outer cortex and inner medulla.
    • Tubules called nephrons are present.
    • The kidney maintains homeostasis by controlling water, ion, and other substance levels in the blood through osmoregulation and excretion.

    Diseases of the Kidney

    • Kidney Stone: Small solids (e.g., calcium phosphate) block the nephrons.
    • Diuresis: Kidney tubules fail to reabsorb water.
    • Nephritis (or Oedema): Inflammatory diseases of the glomeruli; causes kidney swelling.

    The Liver as an Organ of Homeostasis

    • The liver is the largest gland weighing about 1.25 kg and is located below the diaphragm. It is responsible for filtering the blood, converting glucose to glycogen, detoxification, and producing bile among other functions.

    Function of the Liver

    • Blood sugar regulation by converting excess glucose to glycogen for storage (insulin).
    • Regulation of blood proteins like fibrinogen, prothrombin, and globulin.
    • Detoxification (processing harmful substances).
    • Biliary function (producing and storing bile for fat digestion).
    • Production of heat.

    Diseases of the liver

    • Diabetes Mellitus: Inability of the liver to convert glucose to glycogen due to lack of insulin.
    • Infective Hepatitis (Viral Hepatitis): Inflammation of liver cells due to viruses.
    • Gall Stones: Stones formed in the gall bladder; disrupt bile flow.
    • Cancer of the Liver: Outgrowth of unregulated cells preventing normal liver function.
    • Cirrhosis: Damaged liver cells replaced by useless fibrous tissue.
    • Jaundice: Breakdown of red blood cells causing excess bilirubin.

    Hormonal Coordination (Unit 2)

    • Endocrine system includes glands that produce and release hormones to regulate bodily functions.
    • Hormones are chemical messengers carried by the blood stream that affect target organs.

    Types of Plant Hormones

    • Auxins: Stimulate or inhibit growth, responsible for phototropism (responding to light), geotropism (responding to gravity), and apical dominance.
    • -Common examples are; indoleacetic acid (IAA), 2,4-D, and NAA.
    • **Gibberellins:**Promote growth, influence fruit development, and break seed dormancy.
    • Cytokinins: Stimulate cell division, promote lateral bud growth, delay aging.
    • Abscisic Acid: Inhibits growth, promotes dormancy, regulates stomatal opening.
    • Ethylene: Stimulates fruit ripening, promotes abscission (leaf/flower fall).

    Coordination and Response (Unit 3)

    • Coordination is harmonious functioning of all parts.
    • Two communication systems are:
    • Nervous system - fast, electrical impulses
    • Endocrine system - slow, chemical hormones.

    The Nervous System

    • Central Nervous System (CNS): Brain and spinal cord
    • Peripheral Nervous System (PNS): Nerves outside CNS
    • Somatic Nervous System (SNS): Voluntary actions
    • Autonomic Nervous System (ANS): Involuntary actions;
    • Sympathetic: Fight-or-flight response
    • Parasympathetic: Rest-and-digest response

    The Brain

    • Forebrain: Cerebrum, olfactory lobes, thalamus, hypothalamus
    • Midbrain: Optic lobes, pineal body, pituitary gland.
    • Hindbrain: Cerebellum, pons, medulla oblongata

    The Spinal Cord

    • Conducts impulses between brain and body.
    • Centre for reflex actions.

    Reflex Actions

    • Involuntary, rapid responses to stimuli.
    • Do not involve the brain in the decision-making process

    Sense Organs

    • Special organs that detect stimuli from the environment:
    • Eyes
    • Ears
    • Nose
    • Tongue
    • Skin

    The Ear

    • External ear (pinna, auditory canal)
    • Middle ear (eardrum, ossicles)
    • Inner ear (cochlea, semicircular canals)

    The Eye

    • Sclera (outer layer)
    • Cornea (transparent front)
    • Choroid (middle vascular layer)
    • Lens (focuses light)
    • Retina (light-sensitive inner layer)
    • Optic nerve (carries visual information)
    • Accommodation (adjusting focus)

    The Tongue

    • Taste buds detect taste sensations.

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    Description

    Test your knowledge on key biological concepts and hormonal functions as discussed by renowned personalities like Arvind Gupta and Ray Kurzweil. This quiz covers comparisons of biological components, the impact of biology on global issues, and various hormone functions including calcitonin and triiodothyronine.

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