LASU Physiology MCQ Past Questions And Answers - Multiple Choice

Download original Lagos State University (LASU) Physiology Past MCQs Questions and Answers below for your practice. We discovered 189 repeated questions from 2009 to 2016. Read it below and download your complete copy now.

This includes past MCQs in physiology exams administered to students of the following departments in the UI college of medicine
1. Meidicine and surgery
2. Dentistry And Dental Surgery

1. The respiratory quotient
A. Is the ratio of the volume of O2 consumed to the volume of CO2 produced
B. Depends essentially on the type of substrate being metabolized
C. Is 1.0 when glucose is the substrate metabolized.
D. Is between 0.9 and 1.00 in the second week of fasting
E. For the brain is around 1.0.
REVISION NOTES
A. False – It is the inverse of this ratio.
B. True – The respiratory quotients for carbohydrate, fat and protein metabolism are different.
C. True – C6H12O6 + 6O2 + 6CO2 + 6H2O; each molecule of O2 consumed results in the production of one molecule of CO2
D. False – It approaches 0.7, the value when fat is the main substrate being metabolized.
E. True – Carbohydrate is the main substrate for brain metabolism.

2. Oxygen consumption tends to increase when the
A. Concentration of oxygen in inspired air rises.
B. Metabolic rate falls.
C. Body temperature rises.
D. Environmental temperature falls.
E. After a meal is ingested.
REVISION NOTES
A. False – The concentration of oxygen in the air breathed is not a determinant of oxygen consumption.
B. False – It rises; metabolic rate is the prime determinant of oxygen consumption.
C. True – This increases metabolic rate by increasing the rate of cellular metabolism.
D. True – More thermogenesis is required to maintain body temperature.
E. True – Due to the specific dynamic action of the food, particularly protein.

3. Breakdown of erythrocytes in the body
A. Occurs when they are 6–8 weeks old.
B. Takes place in the reticulo-endothelial system.
C. Yields iron, most of which is excreted in the urine.
D. Yields bilirubin, which is carried by plasma protein to the liver.
E. Is required for the synthesis of bile salts
REVISION NOTES
A. False – The normal erythrocyte lifespan is 16–18 weeks.
B. True – The RES removes effete RBCs from the circulation.
C. False – Most of the iron is retained for further use.
D. True – The protein makes the bilirubin relatively water-soluble.
E. False – Bile salts are synthesized from sterols in the liver.

4. Arterioles
A. Have a smaller wall:lumen ratio than have arteries.
B. Play a major role in regulating arterial blood pressure.
C. Play a major role in regulating local blood flow.
D. Offer more resistance to flow than capillaries.
E. Have a larger total cross-sectional area than do the capillaries.
REVISION NOTES
A. False – In arterioles the ratio is much greater, at about 1:1.
B. True – They provide most of the peripheral resistance.
C. True – Local flow varies directly with the fourth power of their radii.
D. True – The drop in pressure across arterioles is greater than that across capillaries.
E. False – It is smaller, so blood flow velocity is higher in arterioles.

5. During sleep, there is a fall in the circulating level of
A. Cortisol.
B. Insulin.
C. Adrenaline.
D. Antidiuretic hormone
E. Growth hormone
REVISION NOTES
A. True – The waking catabolic state changes to an anabolic state.
B. True – Insulin secretion occurs mainly in association with meals.
C. True – Adrenaline secretion is associated with stress.
D. False – This rises as plasma osmolality rises; water is lost but not replaced during sleep.
E. False – This increases, allowing growth and anabolic repair of tissue wear and tear.