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Med physiology - Quiz 1 > Homeostasis > Flashcards

Flashcards in Homeostasis Deck (73)
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1

Define Homeostasis.

Homeostasis refer to the dynamic mechanisms that detect and respond to deviations in physiologic variables from their "set point" values by initiating effector responses that restore the variable to the optimal physiological range.

2

Is homeostasis an energy consuming state?

Yes

3

What is constancy?

Standing still

4

What is Equilibrium?

Variations around a normal

5

What is a steady state?

Variations around a normal that require energy to maintain

6

Water makes up ______ of the human body.

2 / 3rds

7

How does homeostasis use water?

Homeostasis uses water and its dissolved substances to create a steady state.

8

Body fluids can be divided into what two categories?

Intracellular Fluid (ICF) and Extracellular Fluid (ECF)

9

Extracellular fluid is the fluid _______ the cell.

Outside

10

25% of the ECF in the fluid protion of the _______ known as _______.

Blood
Plasma

11

75% of the ECF lies around/between the cells known as _________ _______.

Interstitial fluid

12

ECF = ________ + ________

Plasma + Interstitial fluid

13

Define diffusion

The movement of a solute from an area of greater solute concentration to an area of lower solute concentration.

14

The difference in solute concentrations is known as the ___________ _________.

Concentration gradient

15

Define Osmosis

The movement of water down the concentration gradient across a semi permeable membrane

16

Active transport requires _____, ______ , and _______ for molecules to be moved into the cell.

1. life
2. biological activity
3. expenditure of metabolic energy by the cell

17

Water and small uncharged molecules move across a cell membrane through ______ _______.

Passive transport

18

Large molecules (glucose) and Ions (Na+, HCO3-) move across a cell membrane through ______ _______.

active transport

19

What is facilitated diffusion?

The use of protein transporter to move a solute across a membranewithout expending energy

20

What is an example of a molecule that uses facilitated diffusion?

Glucose

21

Active transport move ___ the concentration gradient.

Up

22

Describe endocytosis (THINK: Packaging)

A section of the plasma membrane enfolds a substance out side the cell, folds across the membrane, separates from the membrane forming a vesicle that moves inside the cell - (EX: Nutrients)

23

Describe Exocytosis

Secretion of material from inside the cell using vesicles at the cell surface

24

The cell membrane is made up of a ________.

Phospholipid bilayer

25

A cell's phospholipid bilayer is also known as _________.

amphipathic

26

A cell membrane is ________ permeable.

Selectively

27

What things do cells need to bring in?

Food (Glucose), O2, Water, Nutrients, Messages

28

What things do cells need to send out?

Trash (CO2), Goods (Hormones, carrier proteins)

29

What things do cells need to keep in?

Water, orangelles

30

What things do cells need to keep out?

Pathogens