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Flashcards in Cellular Physiology (Part 1) Deck (73)
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1

Total body water accounts for how much of total body weight?

50-70%

2

Low body fat = ___ total body water
High body fat = ___ total body water

high

low

3

Do males or females tend to have less body water and why?

Females, because they have a higher percentage of adipose tissue

4

Total body water is distributed between what 2 major body fluid compartments?

intracellular fluid and extracellular fluid

5

ICF is contained within the cells and constitutes how much of total body water?

2/3

6

ECF is outside the cells and constitutes how much of total body water?

1/3

7

The ECF is further divided into what 2 compartments?

- plasma
- interstitial fluid

8

What is plasma?

the fluid circulating in the blood vessels

9

What is interstitial fluid?

the fluid that actually bathes the cells

10

Which constitutes a larger percentage of the ECF, plasma or interstitial fluid?

the interstitial fluid

11

What separates the ICF and ECF?

What separates the plasma and interstitial fluid?

cell membrane

capillary wall

12

What is the major difference between the plasma and interstitial fluid?

Because the capillary wall is impermeable to large molecules, the interstitial fluid does not contain any proteins, whereas the plasma does

13

One mole is 6 x 10 ^__ molecules of a substance

23

14

Amounts of a solute are expressed in what?
Concentrations of solutes are expressed in what?

moles, equivalents, or osmoles

moles per liter, equivalents per liter, or osmoles per liter (in biological solutions use milli-)

15

An equivalent is used to describe the amount of what?

charged (ionized) solute

16

one millimole is 1/___ moles

1000

17

What is an osmole?

The number of particles into which a solute dissociates in solution

18

How do you calculate an equivalent?

multiply the number of moles of the solute by its valence (number of electrons an ion can attach to)

19

What is osmolality?

The concentration of particles in solution expressed as osmoles per kilogram

20

What is osmolarity?

The concentration of particles in solution expressed as osmoles per liter

21

If a solute dissociates into more than one particle in solution, then its osmolarity equals what?

the molarity multiplied by the number of particles in solution

22

If a solute does not dissociate in solution then its osmolarity is equal to what?

its molarity

23

As the concentration of H+ increases, then pH _____, and as the concentration of H+ decreases, pH _____.

decreases

increases

24

pH is used to express the concentration of what ion?

hydrogen (H+)

25

What is the principle of macroscopic electroneutrality?

each compartment must have the same concentration of positive and negative charges

26

What is normal body pH?

7.4

27

What is the major cation and 2 balancing anions in the ECF?

cation: sodium (Na+)
anions: chloride (Cl-) and bicarbonate (HCO3-)

28

Cations are ____ charged
Anions are _____ charges

positively
negatively

29

Is the ICF or ECF more acidic (lower pH)?

ICF

30

What are the 2 major cations and 2 balancing anions in the ICF?

cations: potassium (K+) and magnesium (Mg+)
anions: proteins and organic phosphates