Question 1

Which of the following best distinguishes between sensation and perception in the context of sensory systems?

Accepted Answer

Sensation is the process by which sensory receptors convert stimulus energy into neural signals, while perception is the interpretation of those signals by the brain.

Question 2

Which of the following correctly matches a type of sensory receptor with the energy it transduces?

Accepted Answer

Photoreceptors: light energy

Question 3

A patient is unable to maintain balance when standing still, but has no hearing loss. Which structure is most likely damaged?

Accepted Answer

The semicircular canals of the inner ear

Question 4

Which sequence correctly describes the process by which pressure waves are transduced into action potentials in the mammalian ear?

Accepted Answer

Pressure waves vibrate the basilar membrane, bending hair cells, which open ion channels and generate receptor potentials that trigger action potentials in sensory neurons.

Question 5

Which of the following best explains why rods are more sensitive to dim light than cones?

Accepted Answer

Rods contain more light-absorbing pigment and are more likely to summate signals, increasing sensitivity in low light.

Question 6

In the sliding-filament model of muscle contraction, which event directly causes the myosin head to detach from actin?

Accepted Answer

Binding of ATP to the myosin head

Question 7

A person is exposed to a novel odorant. Which of the following best describes the initial cellular response in the olfactory system?

Accepted Answer

The odorant binds to a receptor on the olfactory cilia, activating a G protein that triggers a signal transduction pathway, leading to a receptor potential.

Question 8

Which of the following statements about the control of muscle contraction is correct?

Accepted Answer

Calcium ions bind to troponin, causing tropomyosin to move and expose binding sites on actin.

Question 9

Which of the following best describes the adaptive advantage of slow muscle fibers?

Accepted Answer

They are resistant to fatigue and suited for endurance activities due to their high mitochondrial content.

Question 10

Which of the following is a key difference between skeletal muscle and cardiac muscle?

Accepted Answer

Cardiac muscle cells are connected by intercalated discs, while skeletal muscle cells are not.

Question 11

Which of the following best explains how insects detect sound?

Accepted Answer

They use specialized mechanoreceptors, such as tympanal organs, that vibrate in response to sound waves.

Question 12

Which of the following is the correct order of events in sensory transduction?

Accepted Answer

Stimulus energy is converted to a receptor potential, which may trigger an action potential transmitted to the CNS.

Question 13

Which of the following best describes the function of the statocyst in invertebrates?

Accepted Answer

It detects the position of the animal relative to gravity using mechanoreceptors and statoliths.

Question 14

A person tastes a bitter compound. Which of the following best describes the process by which this taste is detected?

Accepted Answer

A chemoreceptor on the tongue binds the compound, triggering a signal transduction pathway that generates a receptor potential.

Question 15

Which of the following best explains how the nervous system produces graded contractions of whole muscles?

Accepted Answer

By varying the number of motor units activated and the rate at which they are stimulated.

Question 16

Which of the following is true regarding the difference between the compound eye of insects and the single-lens eye of molluscs?

Accepted Answer

The compound eye is made up of many ommatidia, each with its own lens, while the single-lens eye focuses light through one lens onto a retina.

Question 17

Which of the following best describes the process by which rods and cones transduce light into action potentials?

Accepted Answer

Light absorption changes the shape of a visual pigment, leading to a change in membrane potential and altered neurotransmitter release.

Question 18

Which of the following is a function of the human cochlea?

Accepted Answer

It contains hair cells that transduce sound vibrations into electrical signals.

Question 19

Which of the following best explains the basis of sensory discrimination of human smell?

Accepted Answer

Each olfactory receptor cell expresses only one type of odorant receptor, and different odorants activate unique combinations of receptors.

Sensory and Motor Mechanisms: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards