Download BIO242 Lab 27 Endocrine

Lab 27 Endocrine System
BIOL 242
Use this handout to guide your work on Lab 27. Please follow the instructions carefully, and submit all
work from this hando ut along with (s tapled to) the completed Review Sheet for Lab 27 from the lab
manual. General Tips: Sketches must always include a LABEL, total magnification, and should be
labeled according to the instructions on this handout. If there are questions asked of you, make sure to
answer them! Just include your answer alongside of or just beneath the relevant sketch. Again, hand i n
labeled sketches (total of 5 this time), and answers to questions below along with the Review Sheet.
Pituitary
A. Draw and clearly label the pars distalis, pars intermedia, and posterior pituitary. State the types of
cell found in each region (are they neuronal, or endocrine)?
B. Clearly list ALL of the hormones released by EACH region of the pituitary.
Thyroid
A. Draw and clearly label a portion of the thyroid gland. Label/indicate: at least 2 follicles,
epithelial cells that make up a single follicle (specify the TYPE of epithelial cell), and
thryglobulin.
B. Look for C cells (parafollicular cells). They are clear so they may be hard to see. Even if you
don’t find any, state the function of C cells (what hormone do they secrete and what does this
hormone do?).
Parathyroid
A. Draw and clearly label a portion of the thyroid gland that contains parathyroid tissue. In your
sketch, label follicles of the thyroid tissue, and indicate parathyroid tissue.
B. What is the major endocrine cell here? What hormone do these cells secrete and what is the
function of this hormone?
Adrenal Glands
NOTE: I recommend the slide labeled, “Adrenal (Supradrenal)” HO 3-1
A. On medium or high power, label the three regions of the adrenal cortex. For each region, note the
class of hormones produced and released. Be sure to indicate total magnification of your sketch!
B. What does the adrenal medulla release?
Pancreas
A. Draw and clearly label a portion of the pancreas. Label both exocrine and endocrine cells.
B. Label an Islet of Langerhans (in this slide, islets tend to stain much lighter in color compared to
acinar cells). List the two cell types found in the islet that are critical for the regulation of blood
glucose. For each cell type, list the hormone it releases.
Gonads
Skip the gonads. We will revisit them in the Reproductive System.