Question

1. What is the protective covering of the brain and spinal cord composed of 3 layers ? A) Myelin sheath B) Neuroglia C) Neurilemma D) Meninges 2. Which of the following is the functional unit of kidney? A) Tubule B) lobe C) Lobule D) Nephron 3. Which of the following is responsible for the lub-dub sound heard during a heartbeat? A) Closure of the atrioventricular valves - closure of the semilunar valves B) Closure of the semilunar valves - closure of the atrioventricular valves C) Contraction of the atria - relaxation of the ventricles D) Contraction of the ventricles - relaxation of the atria E) None of the above 4. Which of the following structures is responsible for the production of surfactant, a substance that reduces surface tension within the alveoli? A) Pharynx B) Larynx C) Trachea D) Bronchioles E) Type II alveolar cells 5. How does temperature affect heart rate and cardiac function? A) Fever decreases heart rate. B) Decreased temperature increases heart rate. C) Fever greatly increases heart rate; prolonged high temperature weakens the heart. D) Temperature has no impact on heart rate or cardiac function. 6. Which structure serves as a shared passageway for both air and food but has a cartilaginous flap that prevents food from entering the trachea during swallowing? A) Nasopharynx B) Laryngopharynx C) Oropharynx D) Epiglottis E) Glottis 7. How does the parasympathetic nervous system affect heart function? A) It increases heart rate and contractile strength. B) It hyperpolarizes pacemaker cells via acetylcholine, potentially stopping the heart temporarily. C) It has no effect on heart rate or function. D) It depolarizes pacemaker cells, increasing heart rate.

          1. What is the protective covering of the brain and spinal cord composed
of 3 layers ?
A) Myelin sheath
B) Neuroglia
C) Neurilemma
D) Meninges
2. Which of the following is the functional unit of kidney?
A) Tubule
B) lobe
C) Lobule
D) Nephron
3. Which of the following is responsible for the lub-dub sound heard
during a heartbeat?
A) Closure of the atrioventricular valves - closure of the semilunar
valves
B) Closure of the semilunar valves - closure of the atrioventricular
valves
C) Contraction of the atria - relaxation of the ventricles
D) Contraction of the ventricles - relaxation of the atria
E) None of the above
4. Which of the following structures is responsible for the production of
surfactant, a substance that reduces surface tension within the alveoli?
A) Pharynx
B) Larynx
C) Trachea
D) Bronchioles
E) Type II alveolar cells
5. How does temperature affect heart rate and cardiac function?
A) Fever decreases heart rate.
B) Decreased temperature increases heart rate.
C) Fever greatly increases heart rate; prolonged high temperature
weakens the heart.
D) Temperature has no impact on heart rate or cardiac function.
6. Which structure serves as a shared passageway for both air and food
but has a cartilaginous flap that prevents food from entering the
trachea during swallowing?
A) Nasopharynx
B) Laryngopharynx
C) Oropharynx
D) Epiglottis
E) Glottis
7. How does the parasympathetic nervous system affect heart function?
A) It increases heart rate and contractile strength.
B) It hyperpolarizes pacemaker cells via acetylcholine, potentially
stopping the heart temporarily.
C) It has no effect on heart rate or function.
D) It depolarizes pacemaker cells, increasing heart rate.

Added by Afnan A.

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