Set 6 Phys

What six factors affect metabolic rate?

Age and sex, amount of lean muscle mass, activity level, energy intake (diet), hormones and genetics

What effectors increase in body temperature?

Vasoconstriction decreases heat loss through skin, adrenal medulla released hormones to increase cellular metabolism, skeletal muscles contract (shivering) and thyroid gland releases hormones that increase metabolic rate

What is the response to increased temperature?

Sympathetic cholinergic neurons

What is the response to decreased temperature?

Sympathetic adrenergic neurons and somatic motor neurons

What do sertoli cells secrete?

anti-mullerian hormone

What does testosterone control?

Development of Wolffian duct and male external genitalia

What does anti-mullerian hormone control?

regression of mullerian duct

How many chromosomes are there per cell?

46

What does mitosis do?

Germ cell proliferation

What does meiosis do?

DNA replicates but no cell division (46 chromosomes duplicated)

What does first meiotic division do?

Primary gamete divide into two secondary gametes (23 chromosomes duplicated)

What does second meiotic division do?

secondary gamete divides (23 chromosomes haploid)

What are the six steps of cell division?

Mitosis, meiosis, first meiotic division, secondary meiotic division, unfertilized egg passes out of body and second polar body disintegrates