Human Physiology MCQ

Physiologyplus has put together Human Physiology MCQs (II) 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. The liver is the principal site for
A. Synthesis of plasma albumin
B. Synthesis of plasma globulins
C. Synthesis of vitamin B12
D. Storage of vitamin C
E. Storage of iron
ans
A. True
B. False
C. False
D. False
E. True

2. In the colon
A. A greater volume of water is absorbed than in the small intestine.
B. Mucus is secreted to lubricate the fecal contents.
C. Fecal transit time is normally about 7 days.
D. Fecal transit time is inversely related to its fiber content.
E. Bacteria normally account for about three quarters of the fecal weight.
ans
A. False
B. True
C. False
D. True
E. False

3. Gastric juice
A. Is secreted when the vagus nerves are stimulated.
B. Is secreted in vagotomized animals when food is chewed but not swallowed.
C. Inactivates the digestive enzymes secreted with saliva.
D. Does not digest the gastric mucosa because it is protected by a pepsin inactivator
E. Irritates the esophageal mucosa if regurgitated from the stomach.
ans
A. True
B. False
C. True
D. False
E. True

4. Saliva is necessary for
A. Digestion of food
B. Swallowing of food
C. Normal speech
D. Antisepsis in the mouth
E. Taste sensation.
ans
A. False
B. False
C. True
D. True
E. True

5. The stomach
A. Is responsible for absorbing about 10 per cent of the ingested food
B. Contains mucosal cells containing high concentrations of carbonic anhydrase
C. Peristaltic contractions start from the pyloric region
D. Motility increases when fat enters the duodenum
E. Relaxes when food is ingested so that there is little rise in intra-gastric pressure
ans
A. False
B. True
C. False
D. False
E. True

6. Hydrostatic pressure in renal glomerular capillaries
a. Is lower than pressure in efferent arterioles
b. Rises when afferent arterioles constrict
c. Is higher than in most capillaries at heart level
d. Falls by 10 per cent when arterial pressure falls by 10 per cent
e. Falls along the length of the capillary
ans
A. False
B. False
C. True
D. False
E. True

7. Tubular reabsorption of a filtered substance is likely to be active rather than passive if its
a. Concentration in the tubular fluid is lower than in peritubular capillary blood.
b. Excretion is increased by cooling the kidney.
c. Renal clearance is lower than that of inulin
d. Renal clearance rises at high plasma levels
e. Urinary excretion rate:plasma concentration ratio is the same as for glucose.
ans
A. True
B. True
C. False
D. True
E. True

8. The renal clearance of a substance
a. Is inversely related to its urinary concentration, U.
b. Is directly related to the rate of urine formation, V.
c. Is directly related to its plasma concentration, P.
d. Is expressed in units of volume per unit time.
e. Must fall in the presence of metabolic poisons
ans
A. False
B. True
C. False
C. True
E. False

9. In fluid in the distal part of the proximal convoluted tubule
a. Urea concentration is higher than in Bowman’s capsule.
b. pH is less than 6 when the kidneys are excreting an acid urine.
c. Glucose concentration is similar to that in plasma.
d. Osmolality is about 25 per cent that of glomerular filtrate.
e. Bicarbonate concentration is lower than in plasma.
ans
A. True
B. False
C. False
D. False
E. True

10. Renal tubules normally reabsorb
a. More water every hour than the entire plasma volume
b. All filtered HCO3 in respiratory acidosis.
c. All filtered amino acids.
d. All filtered plasma proteins.
e. More K than Cl
ans
A. True
B. True
C. True
D. True
E. False

11. As plasma glucose concentration rises above normal, glucose
a. Filtration increases linearly
b. Transport maximum Tm increases linearly
c. Clearance increases linearly
d. Reabsorption increases and then levels off
e. Excretion increases and then decreases.
ans
A. True
B. False
C. False
D. True
E. False

12. Non-myelinated axons differ from myelinated axons in that they are
A. Not sheathed in Schwann cells.
B. Not capable of regeneration after section
C. Found only in the autonomic nervous system.
D. Less excitable
E. Refractory for a longer period after excitation
ans
A. False
B. False
C. False
D. True
E. True

13. Resting nerve cell membranes are more permeable to
A. Organic anions than to Cl anions
B. K ions than to Cl ions
C. Na ions than to K ions
D. Oxygen molecules than to glucose molecules
E. Water molecules than to H ions
ans
A. False
B. False
C. False
D. True
E. True

14. Acetylcholine
A. Acts on the same type of receptor on postganglionic fibers in sympathetic and parasympathetic ganglia
B. Acts on the same type of receptor on target organs at cholinergic sympathetic and parasympathetic nerve terminals
C. Acts on the same type of receptor at autonomic ganglia and at somatic neuromuscular junctions
D. Acts as an excitatory transmitter in the basal ganglia
E. In blood is hydrolyzed by the same cholinesterase as is found at neuromuscular junctions.
ans
A. True
B. True
C. False
D. True
E. False

15. Visceral smooth muscle differs from skeletal muscle in that
A. It contracts when stretched.
B. It is not paralyzed when its motor nerve supply is cut.
C. Its cells have unstable resting membrane potentials.
D. It contains no actin or myosin.
E. Excitation depends more on influx of extracellular calcium than release of calcium from endoplasmic reticulum.
ans
A. True
B. True
C. True
D. False
E. True

16. An inhibitory post-synaptic potential
A. May be recorded in a post-ganglionic sympathetic neuron.
B. May be recorded in an anterior horn motor neuron.
C. Does not exceed one millivolt in amplitude
D. Moves membrane potential towards the equilibrium potential for potassium
E. May summate in space and time with other excitatory and inhibitory potentials in the same neuron
ans
A. False
B. True
C. False
D. True
E. True

17. As blood passes through systemic capillaries
A. pH rises.
B. HCO3 ions pass from red cells to plasma.
C. Cl ion concentration in red cells falls.
D. Its oxygen dissociation curve shifts to the right.
E. Its ability to deliver oxygen to the tissues is enhanced
ans
A. False
B. True
C. False
D. True
E. True

18. The respiratory center
A. Is in the hypothalamus
B. Sends impulses to inspiratory muscles during quiet breathing
C. Sends impulses to expiratory muscles during quiet breathing
D. Is involved in the swallowing reflex
E. Is involved in the vomiting reflex
ans
A. False
B. True
C. False
D. True
E. True

19. The carotid bodies
A. Are stretch receptors in the walls of the internal carotid arteries.
B. Have a blood flow per unit volume similar to that in the brain.
C. Are influenced more by blood PO2 than by its oxygen content.
D. Generate more afferent impulses when blood H ion concentration rises.
E. And the aortic bodies are mainly responsible for the increased ventilation in hypoxia.
ans
A. False
B. False
C. True
D. True
E. True

20. Pulmonary surfactant increases
A. The surface tension of the fluid lining alveolar walls
B. Lung compliance
C. In effectiveness as the lungs are inflated
D. In amount when pulmonary blood flow is interrupted
E. In amount in fetal lungs during the last month of pregnancy
ans
A. False
B. True
C. False
D. False
E. True

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