Science: The Respiratory System
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Questions and Answers

What is the primary consequence of deforestation in ecosystems?

  • Increased biodiversity
  • Improvement of air quality
  • Loss of species habitat (correct)
  • Enhanced photosynthesis

    • Which process occurs during the light-dependent reactions of photosynthesis?

  • Conversion of CO2 into glucose
  • Breakdown of organic matter
  • Release of oxygen from glucose
  • Production of ATP and NADPH (correct)

    • What defines extinction in biological terms?

  • Temporary endangerment of a species
  • Reduction in population size
  • Minor decline in species numbers
  • Total loss of all members of a species (correct)

    • What is the primary effect of overexploitation on wildlife populations?

    <p>Decline in species recovery rates</p> Signup and view all the answers

    What is the role of the chloroplast in photosynthesis?

    <p>Converts light energy into chemical energy</p> Signup and view all the answers

    Which blood group is known as the universal donor?

    <p>Blood Group O</p> Signup and view all the answers

    What characterizes a disease as opposed to a disorder?

    <p>A disease has a known cause while a disorder doesn't.</p> Signup and view all the answers

    What is the function of thrombocytes in the blood?

    <p>Clot blood</p> Signup and view all the answers

    Which statement is true about dominant alleles?

    <p>They are always expressed in several generations.</p> Signup and view all the answers

    What respiratory condition is characterized by inflammation of the large airways in the lungs?

    <p>Chronic Bronchitis</p> Signup and view all the answers

    What is the primary role of monocytes in the body?

    <p>Fighting infections</p> Signup and view all the answers

    Which type of heart disease involves the inability of heart arteries to deliver sufficient oxygen-rich blood?

    <p>Coronary heart disease</p> Signup and view all the answers

    What is the significance of Gregor Mendel in the study of genetics?

    <p>He established the principles of inheritance.</p> Signup and view all the answers

    What is the primary function of the respiratory system?

    <p>To uptake oxygen and release carbon dioxide</p> Signup and view all the answers

    Which structure prevents food from entering the trachea during swallowing?

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

    What is the role of cilia in the respiratory system?

    <p>Filter and move particles out of the airways</p> Signup and view all the answers

    Which part of the heart is responsible for the thickest muscular layer?

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

    What are erythrocytes primarily responsible for?

    <p>Transporting oxygen to the body</p> Signup and view all the answers

    Which type of white blood cell fights allergens and worms?

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

    What is the primary role of the diaphragm in the respiratory system?

    <p>To assist in the expansion and contraction of the lungs</p> Signup and view all the answers

    Which vessels are responsible for carrying deoxygenated blood back to the heart?

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

    What does the Law of Segregation state about alleles during gamete formation?

    <p>The two alleles of each factor separate.</p> Signup and view all the answers

    Which of the following best describes polygenic traits?

    <p>Traits influenced by multiple genes.</p> Signup and view all the answers

    Which type of genetic variation is characterized by changes in nucleotide sequence or gene?

    <p>Genetic mutation.</p> Signup and view all the answers

    What is the key difference between sex-linked genes and autosomes?

    <p>Sex-linked genes determine the sex of an organism.</p> Signup and view all the answers

    Incomplete dominance in patterns of inheritance is characterized by which of the following?

    <p>Both alleles contribute to the phenotype.</p> Signup and view all the answers

    Which of the following correctly defines hybridization?

    <p>Breeding organisms of different species.</p> Signup and view all the answers

    Which description accurately represents genetic variability?

    <p>The potential for genotype variation in response to influences.</p> Signup and view all the answers

    What is represented by the term 'law of independent assortment'?

    <p>Alleles for different traits assort independently during gamete formation.</p> Signup and view all the answers

    Study Notes

    The Respiratory System

    • Comprises organs and tissues for the exchange of oxygen and carbon dioxide.
    • Nose: Visible part with two openings known as external nares or nostrils.
    • Nasal Cavity: Divided by nasal septum, serves as a passageway for air.
    • Pharynx: Five-inch muscular tube for transporting food and air.
    • Larynx: Involved in speech production, constructed of cartilages.
    • Epiglottis: Ensures food does not enter the trachea during swallowing.
    • Trachea: Four-inch tube that extends from the larynx; lined with cilia.
    • Bronchi: Split into right and left primary bronchi leading to the lungs.
    • Bronchioles: Smaller branches that connect bronchi to alveoli (air sacs).
    • Lungs: Located in the thoracic cavity with apex (upper) and base (lower resting on diaphragm).

    The Circulatory System

    • Transports materials throughout the body, essential for life.
    • Heart: Cone-shaped organ weighing less than a pound, with outer parietal and inner visceral pericardium.
    • Heart walls include three layers: epicardium (outer), myocardium (middle), endocardium (inner).
    • Features four chambers: right atrium, left atrium, right ventricle, left ventricle.
    • Contains four valves: two atrioventricular (AV) and two semilunar valves.
    • Blood vessels: Medium for circulation in the cardiovascular system.
    • Blood: Vital fluid composed of erythrocytes (carry oxygen), leukocytes (immune defense), plasma (nutrients), and thrombocytes (clotting).

    Cells in Blood

    • Erythrocytes (RBC): Anucleate, biconcave, responsible for oxygen transportation.
    • Leukocytes (WBC): Nucleated, mobile, provide immune defense, including granulocytes and agranulocytes.
    • Plasma Composition: 92% water, 7% proteins, 1% solutes.
    • Antigens: Determine blood type; Group O is universal donor, Group AB is universal recipient.

    Respiratory Diseases

    • Disorders: Groups of symptoms disrupting normal functions without known causes.
    • Diseases: Medical conditions with identifiable causes.
    • Common respiratory diseases include:
      • Common Cold: Contagious upper respiratory infection.
      • Asthma: Chronic lung disease affecting multiple age groups.
      • Tuberculosis: Infectious disease usually targeting lungs.
      • Emphysema: Deterioration of lung alveoli.
      • Chronic Bronchitis: Inflammation of large airways.
      • Influenza: Viral infection involving nose, throat, and lungs.
      • Lung Cancer: Malignancy forming in lung tissues.

    Cardiovascular Disorders

    • Aneurysm: Swelling in blood vessel wall.
    • Cardiac Arrhythmia: Abnormal heartbeat.
    • Atherosclerosis: Thickening of arterial walls.
    • Coronary Heart Disease: Insufficient oxygen-rich blood supply to the heart.
    • Hypertension: High blood vessel pressure.
    • Anemia: Insufficient hemoglobin in blood.
    • Leukemia: Cancer of blood cells.

    Genetics

    • Genetics: Study of gene inheritance through generations.
    • Genes: Related to Greek genos, meaning "offspring."
    • DNA: Long chain of nucleotides encoding genetic information.
    • Traits: Characteristic features of individuals.
    • Alleles: Different versions of a gene.
    • Dominance: Traits expressed through dominant alleles (e.g., TT for tall).
    • Recessive: Traits requiring two copies to express (e.g., short trait).

    Mendelian Inheritance Patterns

    • Homozygous: Same alleles (e.g., TT or tt).
    • Heterozygous: Different alleles (e.g., Tt).
    • Gregor Mendel: Conducted pea plant experiments, known as "father of genetics."
    • Chromosomes: Structures composed of DNA, with autosomes (22 pairs) and sex chromosomes (23rd pair).
    • Laws of Inheritance:
      • Law of Unit Characters: Traits occur in pairs.
      • Law of Dominance: One allele can mask another.
      • Law of Segregation: Alleles separate during gamete formation.
      • Law of Independent Assortment: Alleles assort independently during gamete formation.

    Genetic Variability

    • Genetic Variability: Diversity in genotype due to genetic and environmental factors.
    • Homologous Recombination: Changes in chromosome structure leading to varied traits.
    • Hybridization: Breeding between different species.
    • Migration: Movement of individuals or populations.
    • Polyploidy: Presence of more than two homologous chromosome sets.
    • Genetic Mutation: Changes in DNA sequence during cell division.

    Sex Chromosomes

    • Comprise X and Y chromosomes determining sex.
    • Females have XX, males have XY.
    • Autosomes: 22 pairs of chromosomes; carry inherited traits.

    Patterns of Inheritance

    • Non-Mendelian Patterns: Include incomplete dominance, multiple alleles, polygenic traits, and sex-linked traits.
    • Examples: Hemophilia (blood clotting disorder), color blindness (color perception deficiency).

    Biodiversity and Environmental Impact

    • Evolution: Changes in species traits over generations.
    • Extinction: Complete loss of organisms.
    • Deforestation: Habitat loss through forest clearing and burning.
    • Overexploitation: Removal of species faster than natural population growth.
    • Pollution: Environmental contamination through various factors.

    Photosynthesis

    • Process converting light energy into chemical energy in plants.
    • Occurs in chloroplasts, involving two phases:
      • Light-dependent Reactions: Convert light to ATP in thylakoids.
      • Light-independent Reactions: Use ATP and NADPH to synthesize glucose in stroma.

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    Description

    Explore the anatomy and functions of the respiratory system in this quiz. Learn about the key organs like the nose, nasal cavity, and pharynx, and their roles in oxygen uptake and carbon dioxide release. Test your knowledge on this essential body system!

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