Hormones of the Neurohypophysis

Question 0

Neuroendocrine reflex

Answer 0

input is neural

output is hormonal

Question 1

1. Oxytocin

“great facilitator of life”

Answer 1

2 target tissues:

1. uterus- enhances contraction of smooth muscle cells in uterine wall
2. breasts- milk ejection (let-down), in response to mechanical stimulation of sucking by infant

Question 2

2. Antidiuretic hormone

Answer 2

decreases urine production
increases retention of water by the body

3 target tissues

1. kidney- retain more water
2. sudoriferous glands- decrease output
3. smooth muscle in walls of arteriolar- they contract & constrict the arteriolar, raising BP (vasopressin)

Question 3

Diabetes insipidus

Answer 3

caused by low levels of ADH
large urine output=dehydration
caused by:
-undersecretion of ADH due to head trauma or a tumor
-loss of blood flow to posterior pituitary

Question 4

Diabetes insipidus symptoms

Answer 4

excessive thirst
craving ice
excessive urine volume (due to lack of ADH)

Question 5

diabetes insipidus treatment

Answer 5

removal or tumor
anti-inflammatories to remove pressure
controlled with ADH (Vasopressin- nasal spray, tablets)