Lab 27. The Endocrine System

Safety info

• Read the two sheets (green and pink)

• Sign the yellow sheet

• Under 18? Please see me.

Lab safety

• First aid kit at the front

• Fire extinguisher at the back

• Eye wash at sink

• Showers in the back

Lab Safety

• No eating or drinking in lab

• Clean up rule:– It is your responsibility to clean up after

yourself and put everything back like you found it

Lab clean up

• Put models back, like you found them

• Put microscopes back

• Put slides back in the proper box

Lab clean up

• Dispose of other items as follows:– Paper towels go in the trash– Broken glass and slide cover slips go in

“broken glass”– Biological waste goes in red bucket– Empty slides get rinsed, dried, and

returned to box– Dissection tools: put in wash– Wipe down your bench area when done

Endocrine Organs

Pituitary Gland

Pituitary

Pituitary Control

Thyroid Gland

Follicles: follicular cells surrounding lumen filled with thyroglobulin T3, T4

C Cells (parafollicular cells): Calcitonin

Thyroid

Parathyroid Gland

Chief cells:

Oxyphil cells

Adrenal Glands

Adrenal Glands

• Cortex– Zona glomerulosa: mineralcorticoids– Zona fasciculata: glucocorticoids– Zona reticularis: sex steroids

• Medulla: epinepherine and norepinepherine

Pancreas

Pancreas

• Endocrine pancreas:– Islets of Langerhans

• Alpha cells: glucagon• Beta cells: insulin

• Exocrine pancreas:– Acinar cells: digestive

juices, buffers

Interstitial Cells:

Secrete testosterone

Male Gonad:Testis

Follicular cells: secrete estrogens

As corpus luteum, secrete estrogen and progesterone

Female Gonad:Ovary

Today’s Lab

• Examine slides:– Thyroid gland– Parathyroid gland– Pancreas– Pituitary– Adrenal gland – Draw and label each tissue on paper provided

• Complete review sheet• Due next week in lab (Thursday)