Biology Chapter 3: Chemistry of Life
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Questions and Answers

What is the charge of a proton?

  • Neutral
  • Variable
  • Negative
  • Positive (correct)
  • A molecule consists of two or more different elements bonded together.

    False

    What type of bond is formed when electrons are shared between atoms?

    Covalent bond

    In an ionic bond, a cation is an atom that _____ electrons.

    <p>loses</p> Signup and view all the answers

    Match the types of bonds to their descriptions:

    <p>Ionic Bond = Electrons are transferred between atoms Covalent Bond = Electrons are shared between atoms Cation = Positively charged ion Anion = Negatively charged ion</p> Signup and view all the answers

    What type of sweat gland is associated with the release of product by shedding cytoplasm?

    <p>Apocrine</p> Signup and view all the answers

    Holocrine glands kill their own cells as they release substances.

    <p>True</p> Signup and view all the answers

    Name one component of connective tissue.

    <p>Cells, extracellular fibers, or ground substance</p> Signup and view all the answers

    The cells that produce the matrix in connective tissue are called ______.

    <p>Fibroblasts</p> Signup and view all the answers

    Match the type of connective tissue fiber with its description:

    <p>Collagen = Strong, flexible fibers that resist force in one direction Reticular = Network of interwoven fibers that stabilize structures Elastic = Branched fibers that return to original length after stretching</p> Signup and view all the answers

    What is the primary difference between anatomy and physiology?

    <p>Anatomy is the study of composition and location, while physiology examines functions.</p> Signup and view all the answers

    Homeostasis requires only the control center to function effectively.

    <p>False</p> Signup and view all the answers

    What is a negative feedback loop in terms of homeostasis?

    <p>A mechanism that counteracts the initial fluctuation in a physiological variable.</p> Signup and view all the answers

    The __________ level is the smallest unit of life that performs specific functions.

    <p>cellular</p> Signup and view all the answers

    Match the following levels of organization with their descriptions:

    <p>Organism level = Organ systems work together to maintain homeostasis Organ system level = Group of organs that perform specific functions Tissue level = Groups of cells that perform a function Chemical level = Atoms combine to form molecules with complex shapes</p> Signup and view all the answers

    What occurs during hypotonic conditions for a cell?

    <p>The cell gains water and swells.</p> Signup and view all the answers

    Active transport does not require energy (ATP).

    <p>False</p> Signup and view all the answers

    What is the primary function of epithelial tissue?

    <p>To cover exposed surfaces, line internal passageways, and form glands.</p> Signup and view all the answers

    In exocytosis, a _____ releases its content into the external environment.

    <p>vesicle</p> Signup and view all the answers

    Match the types of epithelial tissue with their characteristics:

    <p>Simple squamous = Adapted for absorption and diffusion Stratified squamous = Protects against attacks Cuboidal = Cube-shaped Columnar = Tall, slender hexagons</p> Signup and view all the answers

    Which function is primarily associated with neural tissue?

    <p>Carrying electrical signals</p> Signup and view all the answers

    A vascular tissue has its own blood vessels for nutrient supply.

    <p>False</p> Signup and view all the answers

    Name one type of intercellular connection found in epithelial tissue.

    <p>Gap junctions or Desmosomes</p> Signup and view all the answers

    Endocrine glands release their secretions into _____ fluid.

    <p>interstitial</p> Signup and view all the answers

    What is the main purpose of mitosis?

    <p>To repair damaged cells.</p> Signup and view all the answers

    What is the main function of the stratum basale?

    <p>Forms a strong bond between epidermis and dermis</p> Signup and view all the answers

    The stratum lucidum is found in all areas of the skin.

    <p>False</p> Signup and view all the answers

    What are the two main functions of osteocytes?

    <p>Maintain matrix locally and repair damaged bone.</p> Signup and view all the answers

    The ______ has 15 to 30 layers of keratinized cells and is water resistant.

    <p>stratum corneum</p> Signup and view all the answers

    Match the following components of bone tissue with their functions:

    <p>Osteoblasts = Secrete matrix compounds and assist in bone formation Osteoclasts = Break down bone tissue Osteocytes = Maintain and repair bone matrix Osteogenic cells = Give rise to osteoblasts</p> Signup and view all the answers

    Which layer of the dermis provides support to epithelial tissue?

    <p>Papillary layer</p> Signup and view all the answers

    What triggers the action potential in a neuron?

    <p>The graded potential exceeds the threshold level</p> Signup and view all the answers

    The hypodermis stabilizes skin and allows separation from underlying structures.

    <p>True</p> Signup and view all the answers

    All action potentials are of varying magnitudes depending on the size of the graded potential.

    <p>False</p> Signup and view all the answers

    What is the main function of sebaceous glands?

    <p>Secrete sebum to lubricate the epidermis and inhibit bacteria.</p> Signup and view all the answers

    What is the function of nociceptors?

    <p>They detect pain, including extreme temperatures and mechanical damage.</p> Signup and view all the answers

    The ______ is the central cavity of a long bone, which contains marrow.

    <p>medullary cavity</p> Signup and view all the answers

    The process of Na+ rushing into the cytoplasm during an action potential is called __________.

    <p>depolarization</p> Signup and view all the answers

    The role of the hair matrix is to produce the hair structure.

    <p>True</p> Signup and view all the answers

    Match the type of sensory receptor with its function:

    <p>Nociceptors = Detects pain and extreme temperatures Thermoreceptors = Detects temperature changes Chemoreceptors = Detects chemical changes Mechanoreceptors = Sensitive to mechanical deformation</p> Signup and view all the answers

    What is the role of K+ channels during an action potential?

    <p>They help in the repolarization of the membrane</p> Signup and view all the answers

    Electrical synapses involve neurotransmitters being released into the synaptic cleft.

    <p>False</p> Signup and view all the answers

    Where are thermoreceptors primarily located?

    <p>In the dermis, skeletal muscles, and hypothalamus.</p> Signup and view all the answers

    Study Notes

    Anatomy and Physiology Study Notes

    • Chapter 1 - Introduction:

      • Definition of anatomy and physiology. Anatomy studies composition and location, while physiology studies function.
      • Levels of organization: organism, organ systems, organs, tissues, cells, and chemical level.
      • Homeostasis: a stable internal environment.
      • Receptor: monitors internal conditions.
      • Control center: processes info, sends instructions.
      • Effector: carries out instructions.
      • Negative feedback loop: a mechanism of homeostasis, a change in a physiological variable is counteracted, (opposite of initial change).
      • Positive feedback loop: amplifies a process.
    • Chapter 2 - Biochemistry:

      • Electron shells: Lowest, 2 electrons; 2nd, 8 electrons; 3rd, 8-18 electrons.
      • Molecules vs. compounds: Molecules are two or more atoms, compounds are two or more different atoms.
      • Types of bonds: ionic (opposite charges), covalent (shared electrons), and polar/non-polar (unequal/equal sharing).
      • Organic vs. Inorganic compounds. Organic: based on carbon; Inorganic: not based on carbon.
      • Hydrophilic vs. hydrophobic: Hydrophilic substances mix well with water; hydrophobic substances do not mix well with water.
      • pH and the pH scale: Neutral pH (7.0), acidic (<7), basic (>7).
    • Chapter 3 - Cell Biology:

      • Plasma membrane functions: Physical isolation, regulation of exchange with the environment, sensitivity, and support.
      • Cytoskeleton:
        • Microfilaments: provide mechanical strength for muscles.
        • Intermediate filaments: strengthen cell and maintain shape.
        • Microtubules: strengthen cell and anchor organelles.
      • Microvilli: increase surface area, and allows for absorption and secretion.
      • Centrioles: involved in cell division.
      • Cilia: microscopic hair which create fluid movement along surfaces.
      • Ribosomes: site of protein synthesis (Free vs. fixed).
      • Ribosomes function: fixed ribosomes attached to ER make proteins for secretion, free ribosomes make proteins for the cell.
      • Endoplasmic Reticulum (ER):
        • Function: synthesis, storage, and modification of proteins and lipids.
        • Rough ER has ribosomes and Smooth ER does not.
      • Golgi apparatus: modifies and packages proteins and lipids for secretion.
      • Lysosomes: breaks down cellular waste.
      • Mitochondria: produce energy (ATP) through cellular respiration.
      • Nucleus: stores genetic material.
    • Chapter 4 - Tissues:

      • Epithelial tissue: covers body surfaces, lines cavities, and forms glands. (characteristics: Cellularity, polarity, attachment, avascularity, regeneration).
      • Connective tissue: connects, supports, and protects other tissues. (elements: cells, fibers, ground substance). Common examples are collagen and elastic fibers and reticular fibers. Cells also can include fibroblasts, adipocytes, mesenchymal cells.
      • Muscle tissue: specialized for contraction. (types: skeletal, cardiac, smooth).
      • Neural tissue: specialized for electrical signaling. (components: neurons, neuroglia).
    • Chapter 5 - Integumentary System:

      • Cutaneous membrane: (layers: epidermis, dermis, hypodermis).
      • Epidermis: keratinocytes.
      • Dermis: papillary layer (upper) and reticular layer (lower)
      • Accessory structures: Hair follicles, sebaceous glands, sweat glands.
      • Epidermis structure: stratum basale, spinosum, granulosum, and corneum (or lucidum in thick skin).
    • Chapter 6 - Osseous Tissue:

      • Bone structure: Diaphysis (shaft), epiphysis (ends), metaphysis.
      • Bone tissue types: compact, spongy
      • Bone cells types: Osteogenic, osteoblasts, osteocytes, osteoclasts
      • Bone formation processes (endochondral ossification, intramembranous ossification).
      • Calcium regulation: Role of Parathyroid hormone (PTH) and Calcitonin. Processes involve either increasing or decreasing calcium levels in the blood to maintain proper levels for bone health and function.
    • Chapter 9 - Muscle Tissue:

      • Three main types: skeletal, cardiac, smooth.
      • Skeletal muscle characteristics: striated, voluntary, multinucleated.
      • Cardiac muscle characteristics: striated, involuntary, single nucleus, intercalated disks.
      • Smooth muscle: non-striated, involuntary, single nucleus.
    • Chapter 11 - Nervous Tissue:

      • Neurons: cell body, dendrites, axon, and synapses. Specialized for communication.
      • Neural function: neuron communicate with one another using graded potentials and action potentials.
      • Neuroglia: support and nourish neurons (types differ between CNS and PNS).
      • Types of neurons: sensory (afferent), motor (efferent), interneurons.
    • Chapter 13 - General Senses:

      • Types of receptors (nociceptors, thermoreceptors, mechanoreceptors, chemoreceptors) and their functions.
      • Sensory pathways (how information is relayed).
    • Chapter 15 - Special Senses:

      • Olfaction: smell
      • Gustation: taste
      • Vision : structure and function of the eye. Light refraction, rods, cones, and the retina.
      • Hearing: structure of the ear, cochlea, semicircular canals, auditory ossicles.

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    Description

    Test your knowledge on the fundamental concepts of the chemistry of life in this quiz. Topics include types of bonds, types of glands, connective tissues, and homeostasis. Perfect for students studying introductory biology.

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