Coordination and Control
268 questions· page 1 of 27
Where are the receptors for the pupil reflex located?
Options
A brain
B iris
C pupil
D retina
The internal body temperature of some animals, including humans, remains constant even when the external temperature changes.
The graph shows how the oxygen used by one of these animals is affected by change in the external temperature.
Which conclusion can be made from this graph?
Options
A The animal stops respiring when the external temperature is greater than .
B The animal’s respiration rate increases as the external temperature decreases from .
C The internal temperature of the animal decreases as the external temperature increases.
D The animal’s respiration rate increases as the external temperature increases.
Which statements about synapses are correct?
- Synapses are junctions between neurones.
- Synapses ensure impulses travel in only one direction.
- Neurotransmitter chemicals diffuse across synaptic gaps.
Options
A 1, 2 and 3
B 1 and 2 only
C 1 and 3 only
D 2 and 3 only
Which process is not part of a homeostatic mechanism in mammals?
Options
A change in flow of blood in vessels of the skin
B growth of longer hairs from the skin
C increased rate of sweat production
D contraction of hair erector muscles
A nurse tests a sample of urine from a patient using Benedict’s reagent. The sample tests positive.
What is a possible explanation for this result?
Options
A The patient’s liver is not deaminating protein efficiently.
B The patient’s pancreas is not producing sufficient insulin.
C The patient has eaten too much glucose.
D The patient’s concentration of plasma proteins is too high.
Which row shows what happens in the eye when focusing on a nearby object?
Options
| ciliary muscle | shape of lens | |
|---|---|---|
| A | relaxes | becomes thinner |
| B | relaxes | becomes rounder |
| C | contracts | becomes thinner |
| D | contracts | becomes rounder |
Which part of the eye contains the greatest density of light receptors?
Options
A cornea
B optic nerve
C iris
D fovea
The diagrams show the front of an eye as seen in cross-section from above.
Which diagram shows the eye observing an object in the distance in dim light?
Options
Different studies have shown that the movement of electrical nerve impulses travelling along neurones slows down with age. Studies A, B, C and D have published different results.
The average speed of a nerve impulse in people who are 40 years old is .
Which study showed the least reduction in transmission speed between the ages of 40 and 60?
Options
A The speed reduced by an average of per year.
B The speed reduced by .
C The speed reduced by 10%.
D The speed reduced by .
The graph shows the concentration of glycogen stored in the liver of a human.
During which period of time is the secretion of adrenaline causing the blood glucose concentration to move towards its set point?
Options
A A
B B
C C
D D