Unit 4 Plasma Membrane Flashcards

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0
Q

What is selectively permeable mean?

A

The ability to select what can come in and what can’t

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1
Q

What is homeostasis?

A

The process of maintaining a cell’s environment

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2
Q

What are the 4 components to the plasma membrane?

A

The phospholipid bilayer, proteins, carbohydrates, and cholesterol

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3
Q

What are the two parts to a phospholipid?

A

A polar head (dissolves in water) and a non polar tail (does not dissolve)

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4
Q

What does hydrophobic mean?

A

Hates water, the phospholipid tails

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5
Q

What does hydrophilic mean?

A

Likes water, phospholipid heads

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6
Q

What is the job of proteins in the membrane?

A

To regulate what goes in and out of the cell

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7
Q

What is the job of carbohydrates in the membrane?

A

Help identify chemical signals, found on the outer surface of the cell

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8
Q

What is the job of cholesterol in the membrane?

A

To prevent the phospholipids from sticking together. Found in between the phospholipids

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9
Q

What is passive transport?

A

A transport that does not require energy

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10
Q

What is active transport?

A

A transport that does require energy

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11
Q

What is diffusion?

A

The net movement of particles from an area of higher concentration to an area of lower concentration, they spread out

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12
Q

What is equilibrium?

A

When particles continue to move randomly, but no further change in concentration will occur.

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13
Q

What is osmosis?

A

The diffusion of water across a membrane. This is a type of passive transport, channel proteins allow water in

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14
Q

What is hypertonic? What happens to RBCs in hypertonic?

A

Extra salty water, and cells shrivel

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15
Q

What is hypotonic? What happens to RBCs in hypotonic?

A

Pure water, cells are perfectly fine

16
Q

What is isotonic? What happens to red blood cells in isotonic?

A

Same salt as RBC, the cells will swell and eventually burst

17
Q

How do dissolved materials get inside the cell?

A

By active and passive transport

18
Q

What is facilitated diffusion?

A

Dissolved materials get into the cell through a channel protein, passive transport

19
Q

What is endocytosis?

A

When a cell uses active transport to wrap itself around a particle from the environment to bring it inside. (Active transport)

20
Q

What is exocytosis?

A

When a cell lets out a particle into the environment (active transport)

21
Q

when is energy needed in transporting?

A

When particles are being moved again the concentration gradient

22
Q

What type of protein needs energy to transport? Carrier or channel

A

Carrier