Practice Mid-Semester Exam Questions

Question 1

Which of the following statements concerning the brain stem is incorrect?
A) The medulla is part of the brain stem
B) The brain stem is a critical connecting link through connecting link through which all fibres traversing between the periphery and higher brain centres must pass
C) The brain stem contains centres that control respiration, blood vessel and heart function, and digestive activities
D) The brain stem regulates drives such as hunger and thirst

Answer 1

D) The brain stem regulates drives such as hunger and thirst

Question 2

The parasympathetic nervous system has little effect on __________ activity

Answer 2

Ventricular

Question 3

Smooth muscle fibres in the bladder demonstrate the “latch phenomenon”.
This means that when the fibres are stretched they will:

Answer 3

Regain tension at the new length

Question 4

A horse has been given a large injection of potassium.

This is likely to cause the membrane potential of nervous tissue to be:

Answer 4

Hypo polarised

Question 5

After a few minutes after being penned, a flock of sheep have increased Red Blood Cell Counts.
This is due to:

Answer 5

Contraction of the Spleen

Question 6

Microglial cells:

Answer 6

Help protect neutrons from infection

Question 7

Platelet aggregation is inhibited by:

Answer 7

Prostacyclin

Question 8

Total peripheral resistance is decreased by:

Answer 8

Atrial natriuretic peptide

Question 9

A 30 kg dog is most likely to have a plasma volume of:

Answer 9

1.5 Litres

Question 10

A pig is 5% dehydrated. The most likely sign would be:

Answer 10

Decreased capillary refill

Question 11

Ependymal Cells:

Answer 11

Line cavities in the CNS

Question 12

When a blood vessel is damaged, blood will leak out of the lesion.
The platelets from the blood will stick to:

Answer 12

Extravascular collagen

Question 13

A 300 Kg sow is most likely to have a plasma volume of:

Answer 13

15 Litres

Question 14

A dog is 5% dehydrated.

The most likely sign would be:

Answer 14

Decreased capillary refill

Question 15

Muscle contraction is stopped by:

Answer 15

A drop in calcium level

Question 16

High concentration of myoglobin will increase the intracellular concentration of:

Answer 16

Oxygen

Question 17

When the heart is filled with an increased volume of blood it usually produces a stronger ventricular contraction because:

Answer 17

It produces a more effective fibre length

Question 18

Smooth muscle fibres in the stomach demonstrate the “latch phenomenon”.
This means that when the fibres are stretched they will:

Answer 18

Regain tension at the new length

Question 19

Lactic acid levels in muscle cells are lowered by:

Answer 19

Diffusion into the bloodstream and breakdown by the Krebs (TCA) Cycle

Question 20

After a few months on high mountain pastures a herd of cattle have increased their Packed Cell Volumes.
This is due to:

Answer 20

Secretion of erythropoietin from the kidney

Question 21

A sound is heard just before the second heart sound.

This sound is occurring during:

Answer 21

Systole

Question 22

A major function of the cerebellum is to:

Answer 22

Coordinate muscular activity during movement

Question 23

Smooth muscle fibres in the bladder demonstrate the “latch phenomenon”.
This means that when the fibres are stretched they will:

Answer 23

Regain tension at the new length

Question 24

Oligodendrocytes:

Answer 24

Produce myelin

Question 25

When a sheep has been eating St John’s Wort, liver damage can lead to a reduced production of albumin.
This will lead to:

Answer 25

More fluid to move from the capillary and into the interstitial space

Question 26

A 500kg dairy cow is most likely to have an extra-cellular fluid volume of:

Answer 26

100 L

Question 27

A sheep is 5% dehydrated.

The most likely sign would be:

Answer 27

Decreased skin elasticity

Question 28

Assume that a membrane that is permeable to Na+ but not to Cl- separates two solutions.
The concentration of sodium chloride on side 1 is much higher than on side 2.
What ionic movement will take place?

Answer 28

A membrane potential, negative on side 1, will develop