Lecture 1-Homeostasis And Cell Function Flashcards Preview

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Flashcards in Lecture 1-Homeostasis And Cell Function Deck (18):
1

Why is homeostasis important to physiological processes?

All life has certain parameters (Temp, BP, BGL, etc.) that must be maintained for continued survival physiologic processes work to keep these in check.

2

Define homeostasis

The "stable internal environment" of an organism.

3

A change to hemostasis produces an effect that reduces the change.

Negative feedback

4

A change in homeostasis occurs, and the effector increases the degree of change.

Positive feedback

5

Something that creates a change to the internal environment.

Stress

6

Most abundant extracellular cation

Na

7

Most abundant intracellular ion

K

8

Most abundant extracellular anion

Chloride

9

F(x)s of the plasma membrane:

- selectivity filter
- endo/exocytosis
- receptors tell about environment

10

Intracellular trafficking organelles

Golgi
E.R.

11

Organelle associated with ATP production

Mitochondria

12

Transport compounds to the lysosome

Endo some

13

Digests phagocytized material

Lysosome

14

Describe the process of endocytosis.

- molecule to be phagocytized binds to extracellular receptor
- clathrin coated pit forms
Invaginate so to become endosome
- fuses w/1* lysosome to form 2* lysosome
- digestion
- exocytosis

15

What is contained in lysosome?

Acidic hydrolases at low pH (p+ pump)

16

What is contained in peroxisomes?

Peroxide ions for degradation of pathogens via free-radical reactions

17

What Re the 3 major functions of the Golgi apparatus?

- package proteins for secretion
- form lysosomes
- modify proteins received from rough ER

18

Acts to detoxify the cell and degrade lipids

peroxisomes