Question

Cindy is studying for a quiz and records in his notes that the SCN is the ______ and ________.

a. superficial cortical nucleus; responds more slowly to phase shifts than clocks in other types of tissue.

b. suprachiasmatic nucleus; is the only biological clock in the body.

c. suprachiasmatic nucleus; may be viewed as the body's “master clock.”

d. superficial cortical nucleus; is one of multiple, independent biological clocks in the body.

Professor Gin tells his class that a person releases human growth hormone during periods of

	a.	REM sleep.
	b.	stages 3 and 4 NREM sleep.
	c.	stages 1 and 2 NREM sleep.
	d.	wakefulness.

Answer 1

1) SCN stands for Supraachiasmatic nucleus. It secretes a hormone called melatonin which is involved in circadian rhythm of body. It is a biological clock of human body. It is also known as master clock of the body. Another biological clocks in body are, in women, relationship between age and menopause. Option C is right.

2) Growth Hormone is a hormone secreted by the Anterior pituitary. It is secreted during NREM sleep especially during stage3 and 4. It decreases during REM sleep. Answer is option b