Physiology 10 Mcqs - 2 - NotesMedicine

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1. Hardening of the arterial walls tends to raise

Arterial compliance.

Diastolic arterial pressure.

Systolic arterial pressure.

Peripheral resistance.

2. Pancreatic secretion

Contains enzymes that digest neutral fat to glycerol and fatty acids.

In response to secretin secretion is low in bicarbonate.

In response to vagal stimulation is copious, rich in bicarbonate but poor in enzymes.

In response to acid in the duodenum is scanty but rich in enzymes.

3. Oxygen consumption tends to increase when the

Metabolic rate falls.

Concentration of oxygen in inspired air rises.

Body temperature falls.

Environmental temperature falls.

4. The cells of the liver

Inactivate steroid hormones manufactured in the gonads.

Synthesize Vitamin D3 (cholecalciferol).

Deaminate amino acids to form NH4

Manufacture most of the immune globulins.

5. Olfactory cells

Generate impulses when stimulated which are relayed in the thalamus.

Are epithelial cells which synapse with olfactory nerves.

Show little adaptation.

Are more important in appreciating the flavour of food.

6. The tympanic membrane

Modifies the frequencies of sound waves impinging on the ear.

Bulges outwards when the pharyngotympanic tube is blocked.

Cannot transmit sound waves if it is perforated.

Stops vibrating almost immediately after the sound stops.

7. The receptor cells serving taste

For sweetness are more common at the tip than at the back of the tongue

Are stimulated when chemicals diffuse through the overlying epithelium to reach them.

Are confined to the tongue.

Are primary sensory neurones.

8. An acid–base buffer system

Can be a solution of sodium and bicarbonate ions.

Can be a mixture of a weak acid and its conjugate base.

With pK=4 would be a better blood buffer than one with pK=6.

Prevents any change in pH when acid is added.

9. Hypoxia in

Smokers is due partly to carboxyhaemoglobin formation in blood.

Life at high altitudes leads to a respiratory acidosis.

Exercising muscle decreases the rate of lactate formation.

Patients with cardiac failure is of the hypoxic variety.

10. In normal healthy people, urinary

Color is due to small quantities of bile pigments.

Specific gravity ranges from 1.010–1.020.

Calcium excretion is increased by parathormone.

Osmolality ranges from 200–400 mosmol/litre.

Physiology 10 Mcqs – 2

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