TOPIC: RegulationAim: Explain the function the different

endocrine glands.

Do Now: Ditto – Human Nervous System Mapping Review

HW: Ditto – Did you Know?

A BX

X

A B C

1.Which cells are target cells for hormone A? Explain why.

2.Which cells are target cells for hormone B? Explain why.

Endocrine Glands

Hypothalamus

•Part of the brain•Produces hormones that control pituitary gland

Pituitary Gland

•Controls activities of other glands (formerly known as the MASTER GLAND)

•Hormones: –Thyroid stimulating hormone (TSH): stimulates thyroid

–Growth Hormone (GH): regulates growth (bones, muscles, tissues)

14-year old Khagendra Thapa Magar shown in the picture with another boy is only 50 centimetres (20 inches) tall and has been submitted to the Guinness world record as the world's smallest person. The previous world record holder was a Jordanian boy at 25.5 inches tall. Weighing only 4.5 kilograms, he is shown in exhibitions to collect fund for his education.

–Follicle stimulating hormone (FSH) and leutinizing hormone (LH): stimulate testes and ovaries

Thyroid

•Releases THYROXINE•Regulates rate of metabolism

This X-ray shows how an enlarged right lobe of the thyroid has moved the trachea to the patient's left. The trachea (outlined in light yellow) should be straight from the mouth down to the lungs, but in this patient it is compressed and displaced far to the left.

Parathyroid glands

•Release PARATHORMONE•Controls level of calcium in blood

Adrenal Glands

•Release adrenaline in times of stress, emergency

•Increases heart rate, blood pressure, breathing rate, sweating

Islets of Langerhans

•Cells on the PANCREAS•Release:

1.Insulin: lowers blood glucose level

2.Glucagon: increases blood glucose level

Gonads

a. Ovaries

•Release: –Estrogen = development of secondary sex characteristics

–Progesterone = prepares uterus for fertilization

b. Testes

•Release testosterone–sperm production

–development of male secondary sex characteristics

Negative Feedback•Maintains homeostasis

•Controls the release of hormones throughout the body

Temperature goes above set

value

Thermostat turns heat off

Temperature falls below set temperature

Thermostat turns on heat

Thermostat

• A hormone can cause the release or stop the release of another hormone

•Examples:1. Maintaining blood sugar levels with insulininsulin and glucagonglucagon

(cells absorb some glucose and liver converts glucose to glycogen)

and more glucagon

(liver converts glycogen to glucose)

Maintaining blood sugar level

Homeostasis: Maindex

2. Amount of thyroxine in the blood

Thyroxine LevelThyroxine level too

low

Pituitary gland secretes TSH

TSH stimulates thyroid to produce thyroxin

Thyroxine level increases

Thyroxine level too high

Pituitary gland stops TSH production

Thyroid decreases thyroxine production

Thyroxine level decreases

3. Maintaining body temperature

Identify the gland being described.

1. Produces thyroxine

2. Regulates calcium levels in the blood

3. Is called the master gland.

4. Controls the pituitary gland

5. Secretes GH, TSH, LH, and FSH