Chedy - theme 10

Question 1

Control centres:

Answer 1

Vestibular nuclei in brain stem and cerebellum coordinate nervous output (responses).

Question 2

Signal transduction:

Answer 2

External stimulus -> change in membrane potential of sensory neurons -> neural signal

Question 3

Sense receptors:

Answer 3

Thermoreceptors, mechanoreceptors, electromagnetic receptors, photoreceptors, chemoreceptors, proprioreceptors, nociceptors (pain)

Question 4

Pacinian corpuscles:

Answer 4

Mechanoreceptors in deep skin. Sensitive to vibration, texture, pressure, low frequency sound. Concentric circles of connective tissue around

Question 5

Meissner’s corpuscles:

Answer 5

Near skin surface. Sensitive to light pressure and touch.

Question 6

Ruffini corpuscles:

Answer 6

Mechanoreceptors in deep skin. Sensitive to skin distortion and deep pressure.

Question 7

Stretch receptors:

Answer 7

Mechanical distortion of ion channels triggers depolarization. Commonly found in organ walls; in stomach, stretch is interpreted as fullness.

Question 8

Stereocilia:

Answer 8

In ear and equilibrium organs, the body surface of some fish and amphibians. Hairlike mechanoreceptors deform and trigger APs AND release a ntransmitter.

Question 9

Lateral line system in fish:

Answer 9

A row of neuromasts (receptor for mechanical changes in water) along each side of the body and a vertical section through the skin and lateral line canal. ***textbook

Question 10

Signal intensity:

Answer 10

Brain interprets higher frequency of APs as a stronger stimulus.

Question 11

In what organisms is the single lens eye found?

Answer 11

Vertebrates, some mollusks/snails/annelids

Question 12

The only detail of the eye that I don’t know - which humour goes in which cavity?

Answer 12

Anterior - aqueous

Posterior - vitreous

Question 13

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Answer 13

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