Human Physiology MCQs With Answers

Physiologyplus has put together Human Physiology MCQs (III) With Answers, from various Physiology exams and tests for health colleges and universities, online Physiology courses, and other medical training programs. Taking our Physiology practice MCQs will help you earn better grades in your Physiology courses. This will pave the way for your medical degree,nursing degree, or other allied health degree. Best Wishes!

1. As people age, there is usually a decrease in their
A. Ratio of lung residual volume to vital capacity
B. Percentage of vital capacity expelled in one second.
C. Lung volume level at which small airways start to close during expiration.
D. Lung elasticity
E. Resting arterial blood PO2
ans
A. False
B. True
C. False
D. True
E. True

2. During inspiration
A. Intrapleural pressure is lowest at mid-inspiration.
B. Intrapulmonary pressure is lowest around mid-inspiration.
C. Intra-esophageal pressure is lowest at mid-inspiration.
D. The rate of airflow is greatest at end-inspiration.
E. The lung volume/intrapleural pressure relationship is the same as in expiration.
ans
A. False
B. True
C. False
D. False
E. False

3. Carbon dioxide
A. Is carried as carboxy-hemoglobin on the hemoglobin molecule.
B. Uptake by the blood increases its oxygen-binding power.
C. Uptake by the blood leads to similar increases in H and HCO3 ion concentrations.
D. Stimulates ventilation when breathed at a concentration of 20 per cent
E. Content is greater than oxygen content in arterial blood
ans
A. False
B. False
C. False
D. False
E. True

4. In the normal menstrual cycle [Select all that apply]
a. Blood loss during menstruation averages around 100 ml
b. The proliferative phase depends on estrogen secretion
c. Cervical mucus becomes more fluid around the time of ovulation
d. Ovulation is followed by a surge in blood luteinizing hormone level
e. Basal body temperature is higher after ovulation
ans
A – False
B – True
C – True
D – False
E – True

5. Fertilization of the human ovum normally [Select all that apply]
a. Occurs in the uterus
b. Prevents further spermatozoa from entering the ovum
c. Occurs 2–5 days after ovulation
d. Occurs 5–7 days before implantation
e. Leads to the secretion of human chorionic gonadotropin (hCG) within two weeks
ans
A – False
B – True
C – False
D – True
E – True

6. Human spermatozoa: [Select all that apply]
a. Contain 23 chromosomes
b. Have enzymes in their heads, which aid penetration of the ovum
c. Are produced faster at 37 than at 32°C
d. Are motile in the seminiferous tubules
e. Are stored mainly in the seminal vesicles
ans
A – True
B – True
C – False
D – False
E – False

7. After a baby is born, there is normally a fall in
a. Its systemic vascular resistance
b. Its pulmonary vascular resistance
c. Direct flow from pulmonary artery to aorta
d. Direct flow from right to left atrium
e. Direct flow from right to left ventricle
ans
A – False
B – True
C – True
D – True
E – False

8. Secretion of testosterone [Select all that apply]
a. Depresses pituitary secretion of LH
b. Causes the epiphyses of long bones to unite
c. May lead to a negative nitrogen balance
d. Stimulates growth of scalp hair
e. Stimulates growth of body hair
ans
A. True
B. True
C. False
D. False
E. True

9. Increasing the salt concentration applied to a ‘salt’ taste bud increases
a. Its sensitivity to salt
b. The amplitude of its generator potentials
c. The amplitude of the action potentials generated
d. Impulse traffic to the thalamus
e. Impulse traffic up the ascending reticular formation
ans
a. False
b. True
c. False
d. True
e. True

10. On entering a darkened room, the: [Select all that apply]
a. Threshold light intensity for the eye starts to rise
b. First phase of retinal adaptation is mainly in the cones
c. Final phase of retinal adaptation is mainly in the rods
d. Adaptation is slower if a long period was spent in bright light beforehand
e. Time course for pupillary dilatation is similar to that for dark adaptation
ans
a. False
b. True
c. True
d. True
e. False

11. Dilation of the pupil increases the
A. Amount of light entering the eye
B. Refractive power of the eye
C. Spherical aberration
D. Depth of focus
E. Field of vision
ans
A. True
B. False
C. True
D. False
E. False

12. The olfactory system can detect
A. 20–40 distinct odors
B. Differences in odor between isomers of the same substance
C. The direction from which an odor comes
D. Small differences in the concentration of the substance responsible for the odor
E. Odors better in old than in young people.
ans
A. False
B. True
C. True
D. False
E. False

13. During accommodation for near vision
A. More light enters the eye.
B. The curvature of the cornea increases.
C. Chromatic and spherical aberration is decreased.
D. The depth of focus increases.
E. The visual axes of the two eyes converge.
ans
A. False
B. False
C. True
D. True
E. True

14. Visual acuity is
A. A measure of the sensitivity of the retina to light
B. Greater in a person with 6/12 (0.5) vision than in one with 6/9 (0.75).
C. Greater using central than using peripheral vision
D. Greater using one eye than using both eyes
E. Greater in normal than in color-blind people
ans
A. False
B. False
C. True
D. False
E. False

15. The tympanic membrane
A. Modifies the frequencies of sound waves impinging on the ear.
B. Stops vibrating almost immediately after the sound stops.
C. Bulges outwards when the pharyngotympanic tube is blocked
D. Transmits sound more effectively when the small muscles of the middle ear are contracted
E. Cannot transmit sound waves if it is perforated
ans
A. False
B. True
C. False
D. False
E. False

16. During prolonged (90 or more minutes) exercise, the preferred energy source for skeletal muscle is:
a. Plasma glucose
b. Plasma fatty acids
c. Muscle triglycerides
d. Muscle glycogen
Correct answer: (b) plasma fatty acid

17. In athletes, physical fitness is more closely correlated with
A. Maximal oxygen uptake than with resting oxygen uptake
B. Maximal pulse rate than with resting pulse rate
C. Maximal minute ventilation than with maximal cardiac output
D. Blood oxygen saturation than with blood lactate level during strenuous exercise
E. Resting vagal tone than with resting sympathetic tone to the heart
ans
A. True
B. False
C. False
D. False
E. True

18. The muscle fibers adapted to endurance running
A. Are classified as slow rather than fast.
B. Have a relatively high myoglobin content.
C. Are red rather than white
D. Have a relatively high mitochondria content.
E. Are classified as anaerobic rather than aerobic.
ans
A. True
B. True
C. True
D. True
E. False

19. The oxygen consumed per minute
A. Is greater than the carbon dioxide produced per minute during long distance running.
B. In the resting adult is nearer 100 than 150 ml.
C. During intense mental activity can rise to twice the resting level.
D. During brisk walking is nearer five times than twice the resting level.
E. In an Olympic athlete can rise to 50 liters.
ans
A. True
B. False
C. False
D. True
E. False

20. The increase in blood flow to muscle in an exercising limb is related to a rise in
A. Local PCO2
B. Local H concentration
C. Local muscle temperature
D. Arterial pressure
E. Vasodilator nerve activity
ans
A. True
B. True
C. True
D. False
E. False

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