How are hormones transported How are hormones transported in the body?in the body?

What is an endocrine gland? Endocrine: secretes fluid into blood Exocrine: secrete fluid into a duct (ex:

sweat)

For your hormone……

HOW DOES IT WORK? WHAT DOES IT DO?

– Suggestion conversation topics:• WHAT GLAND SECRETES (PRODUCES) IT?• WHAT DOES IT CONTROL?• WHAT DOES IT TARGET?• WHAT EFFECT DOES IT HAVE?• WHAT TRIGGERS ITS RELEASE?

ENDOCRINE GLANDS

1. PITUITARY GLAND

a. Thyroid-stimulating hormone (TSH) Tropic hormone (controls another gland)

Growth & activity of thyroid gland specifically controlling metabolism rate

What is a tropic hormone?

a. A synthetic (“man-made”) hormone

b. A hormone that triggers another endocrine gland to secrete its hormones

c. Hormones that affect the gonads

d. Hormones of the thyroid gland

b. Oxytocin- causes contractions

c. Antidiuretic hormone (ADH) Diuresis = urine production causes kidneys to reabsorb

water from the forming urine stimulus? caffeine inhibits ADH

secretion

Which of the following is NOT a hormone secreted by the pituitary gland?a. Oxytocin

b. ADH

c. Thyroid-stimulating hormone

d. Insulin

Summary of the pituitary

Pituitary gland – considered the “master” gland

We covered 3 of the 7 hormones it produces

2. PANCREAS

a. Insulin – regulates blood glucose levels.

– Respond to rising blood glucose levels– Hyposecretion high blood glucose

levels …. Diabetes mellitus1. Polyuria

2. Polydipsia

3. polyphagia

b. Glucagon• regulates blood glucose levels • responds to low blood glucose levels.• Target: liver

3. GONADSA) OVARIES

1. Estrogens –

• stimulate secondary sex characteristics in females• brings about menstrual cycle

2. Progesterone- • brings about menstrual cycle. • Quiets muscles of uterus during pregnancy

Hyposecretion of either: infertility

What does hyposecretion mean?

a. Produces too much

b. Produces too little

c. Secretes to a tropic hormone

d. Is not controlled by a negative feedback mechanism

b) Testes1. Androgens

EX: testosterone– cause growth and maturation of reproductive system;secondary sex characteristics; sperm production in adult

Hyposecretion = infertility

testes

                                                                                  

4. PLACENTA (Temporary organ)

1. human chorionic gonadotropin (hCG) – stimulates ovary to continue producing estrogen and progesterone

Aging and the endocrine glands

Late middle age: efficiency of ovaries begins to decline menopause

GH declines = muscles atrophy Mildly hypothyroid Less able to resist stress/infection (due to

thymus, glucocorticoids of adrenal and melatonin from pineal)

Some decline in insulin production diabetes

(not responsible for this slide)