Cell Membrane 2

Question 1

What do Glycoproteins and Glycolipids do?

Answer 1

They form a protective coat (glycocalyx) and form cell to cell recognition/ interaction

Question 2

How much water is in the body of a 70kg man?

Answer 2

60% of the body is water, 42 of 70kg is water

Question 3

What is Adipose tissue made of

Answer 3

90% lipids, majority are triglycerides
Small fraction of water
Females have slightly more

Question 4

What is Skeletal Muscle made of?

Answer 4

75% water, 18% protein

Question 5

Definition of osmosis

Answer 5

The movement of water across a membrane in response to a solute concentration gradient
-water moves from a region of low solute to high solute

Question 6

What are aquaporin channels?

Answer 6

channels of transmembrane proteins that have a hole always open to allow water to pass through
Leak channels

Question 7

2 Types of extracellular fluid

Answer 7

Interstitial fluid
Plasma

Question 8

Ions High in Extracellular Fluid

Answer 8

Na+
Cl-
Ca2+
HCO3-

Question 9

Ions Higher in Extracellular fluid

Answer 9

K+
Anions (HPO4-, H2PO4-)
Proteins

Question 10

What is Osmotic Pressure

Answer 10

Pressure that would have to be applied to oppose and prevent osmosis

Question 11

What is osmolarity?

Answer 11

The overall solute concentration of a compartment
-takes into account both penetrating and non-penetrating solutes

Question 12

What is the normal osmolarity levels of the human body?

Answer 12

280-296 mOsM (around 300 mOsM)

Question 13

Isosmotic

Answer 13

2 solutions have identical osmolarities (equal)

Question 14

Hyperosmotic

Answer 14

Describes the solution with the higher osmolarity (greater than)

Question 15

Hypoosmotic

Answer 15

Describes the solution with the lower osmolarity (less than)

Question 16

Differences between Osmolarity from tonicity

Answer 16

Osmolarity: describes overall solute concentration
-takes into account all solutes, both penetrating and non penetrating
-measured in mOsM/L

Question 17

Differences from Tonicity from osmolarity

Answer 17

-describes a solution relative to a cell based on how cell volume responds
-only focuses on non-penetrating solutes
-has no units, just comparative
-always compares a solution to a cell
-tells what happens when a cell is placed in a solution

Question 18

Tonicity

Answer 18

Describes a solution and how it would affect cell volume if a cell were placed into the solution and allowed to come to equilibrium

Question 19

Osmolality

Answer 19

Osmoles per kg of solvent