Modes of cellular communication - Answer✔️✔️-Endocrine: cell in
one part of the body sends signal
(hormone) to distant target cells
Paracrine: cell-cell communication
Autocrine: cell stimulates itself
Common cell structures called organelles are either membrane
bound or non membrane bound. Choose the following list that
contains only membrane bound organelles. - Answer✔️✔️-nucleus,
endoplasmic reticulum, lysosome, mitochondrion
When plasma glucose concentration increases, cells in the pancreas
release insulin. Insulin causes a pattern of responses that
decreases glucose concentration. This is an example of - Answer✔️✔️-
Homeostasis maintained by a negative feedback loop
What is your best estimate for the diameter of a pancreatic beta
cell? - Answer✔️✔️-10 microns
Describe the structure of the plasma membrane (PM) - Answer✔️✔️-
Phospholipid bilayer: in an aqueous environment:
Polar (hydrophilic) head groups orient TOWARD polar water
Nonpolar (hydrophobic) tail groups orient AWAY from water
Forms phospholipid bilayer which is the structure of the PM
3
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