GR 12 ENDOCRINE SYSTEM AND HOMEOSTASIS: EXAM BOOKLET MCQs

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Ms Cronje

Mrs Vissian

Ms Viljoen

other

1.1. Which ONE of the following hormones is responsible for the development of secondary male characteristics? *

FSH

Testosterone

Oestrogen

Progesterone

1.2. A patient suffers from an undersecretion of ADH. This will lead to... *

a high concentration of sodium in the urine.

the presence of glucose in the urine.

decreased thirst.

the formation of large volumes of urine.

1.3. Which of the following CORRECTLY represents the events involved in the secretion and action of ADH? *

1.4. A worker spent about 10 minutes in a walk-in freezer. Here are some of the changes that occurred in his body in response to the drop in external temperature. (i) Blood vessels in the skin constrict. (ii) Brain reacts. (iii) Skin temperature changes. (iv) Temperature receptors in the skin detect changes. Which ONE is the correct sequence in which the changes occurred? *

(ii) --> (i) --> (iii) --> (iv)

(iii) --> (i) --> (iv) --> (ii)

(iv) --> (ii) --> (i) --> (iii)

(iv) --> (i) --> (ii) --> (iii)

1.5. When a person runs a race, sweating helps to... *

regulate the amount of salts in the body.

control the amount of glucose in the body.

cool the body through evaporation.

regulate the amount of water in the body.

1.6. Which ONE of the following is a function of adrenalin? *

Lowering blood pressure

Promoting the conversion of glucose to glycogen

Increasing skeletal muscle tone

Causing the blood vessels of the skin to dilate

1.7. The hormone that stimulates the development of the male sex organ: *

Prolactin

Thyroxin

Testosterone

Aldosterone

1.8. Which ONE of the following hormones prepares the human body to react to emergency situations? *

Insulin

Aldosterone

Adrenalin

Growth hormone

1.9. When Jane plays in the snow, her body maintains a constant core temperature by... *

vasodilation and sweating.

vasoconstriction and shivering.

sweating and shivering.

vasoconstriction and vasodilation.

1.10. A cancerous tumour in the pituitary gland/ hypophysis causes an undersecretion of TSH in a patient. One of the possible effects of this on the patient is that his weight... *

decreases because his metabolic rate increases.

remains the same because his metabolic rate is not affected.

decreases because his metabolic rate decreases.

increases because his metabolic rate decreases.

1.11. The hormone that prepares the human body for an emergency situation is... *

ADH.

thyroxin.

adrenalin.

GH.

1.12. After exercising in a gymnasium people often go into a steam room to relax their muscles. The average temperature in a steam room is 41 degrees celcius and the humidity is between 80% and 100%. Which ONE of the following explains why people are advised NOT to stay in a steam room for longer than 15 minutes? *

Increased sweating will cause overcooling.

Sweat will not evaporate causing overheating.

Vasoconstriction will lower sweat production.

Heat receptors in the skin will be damaged.

1.13. A tumour in the hypothalamus of the brain of a patient caused a condition called diabetes insipidus. Some of the patient's symptoms are: dehydration; production of large quantities of dilute urine. Which ONE of the following is the most likely effect of the tumour? *

Increased secretion of TSH

Decreased secretion of ADH

Increased reabsorption of water in the kidneys

Increased permeability of the collecting ducts in the kidney to water

1.14. During periods when the temperature is low, ... *

the thyroxin levels are expected to be low.

sweating increases.

the blood vessels to the skin dilate.

the ADH levels are expected to be low.

1.15. The level of aldosterone will most likely increase after... *

consuming food with a high salt content.

sweating excessively.

consuming food with a high glucose content.

the constriction of blood vessels to the skin.

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