Human Physiology Midterm 2

Which division of the nervous system is responsible for relaying motor information to the skeletal muscles?

• Afferent

• Sympathetic

• Somatic

• Autonomic

What is the function of the cerebrospinal fluid? (Select all)

• Mechanical protection

• Shock Absorption

• Chemical Protection

All sensory receptors have what in common?

• They send information to the brain via a sensory neuron

• When activated, a receptor potential (graded potential) is created

• They use ion channels

• All the above

Which of the following improves localization of sensation?

• Greater receptor density

• Larger receptive fields

• Less overlap of receptive fields

• All the above

The tendon organ reflex does what? (select all that apply)

• inhibits the action of the homonymous muscle

• inhibits the action of the antagonist muscle

• overrides the muscle spindle’s actions

• Is stimulated by stretch in the muscle

Why is the fovea the area of highest visual acuity?

• Contains a high density of photoreceptors

• Light is not blocked by ganglion and bipolar cells

• There is a 1 to 1 ratio of photoreceptors to ganglion cells

• All the above

Which is true about the retina

• There are less rods than cones

• Rods detect colours

• Rods are largely found in the fovea

• Information from the right visual field is sent to the left visual cortex

Which of the following events occurs in the cochlea?

• Vibration of tympanic membrane

• Vibration of ossicles

• Detection of equilibrium

• Depolarization of hair cells

Sympathetic post-ganglionic neurons are:

• Adrenergic

• Cholinergic

• Nicotinic

• Highly allergic

What DOES NOT occur in a muscle fibre following the binding of acetylcholine to its receptor?

• Strong depolarization of the membrane potential

• Inhibition of action potential propagation

• Formation of an end plate potential (EPP)

• Generation of an action potential that travels in all directions across the muscle fibre.