Human Bio 3 Plasma Membrane Flashcards

1
Q

The structure of the Plasma Membrane:

A

Phospholipid Bilayer / 2 layers of phospholipids

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2
Q

Each Phosphlipid is made up of:

A
Phosphate Head( Hydrophillic)
Fatty Acid Tail (Hydrophobic)
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3
Q

Function of the Plasma Membrane:

A

Acts as a protective barrier for cell

Regulates what enters/exits the cell

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4
Q

The 2 types of cellular transportation across the Plasma Membrane:

A

Passive + Active Transport

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5
Q

Define Passsive Transportation:

A

Requires NO energy/ATP

2 types: Diffusion + Osmosis

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6
Q

Define Active Transport:

A

Requires energy/ATP

  1. Na/K Pump
  2. Endocytosis
  3. Exocytosis
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7
Q

Define Diffusion:

A

A form of passive transport
stimulated by concentration differences

Attempts to evenly distribute molecules

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8
Q

The Rate of Diffusion depends on:

A

Distance: shorter length = faster

Solute Size: smaller molecule= faster

Temperature= higher temp. =faster

Concentration Gradient= more molecules= faster

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9
Q

Define Concentration Gradient:

A

The difference in solute concentration form one area to another

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10
Q

The 2 types of Diffusion:

A

Simple Diffusion

Facilitated Diffusion

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11
Q

Define Simple Diffusion:

A

Molecules that can dissolve in lipids(fats) can esily pass through the Phospholipid bilayer

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12
Q

Define Facilitated Diffusion:

A

Proteins in cell membrane that allow water + water soluble materials to pass through

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13
Q

Define Osmosis:

A

Passive transport, WATER or fluid move ACROSS the cell membrane

Travel from high concentration to low concentration

Osmosis stops when in and out of cell are balanced

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14
Q

Define a Aqueous Solution:

A

Water + a solute

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15
Q

Define Osmolarity:

A

Total solute concentration in a Aqueous Solution

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16
Q

When does a cell use Active Transport:

A

Molecules aren’t lipid-soluble

Molecules are too big to fit through channels

Molecules move against concentration gradient

17
Q

All cell membranes contain carrier proteins called:

A

Ion Pumps that move ions like NA, K, CA2

18
Q

Define Endocytosis:

A

Active Transport

The substance is engulfed by a membrane to form a vesicle

19
Q

Define Pinocytosis:

A

A Cell drinking water to create a vesicle of water

20
Q

Define EXOcytosis:

A

Substance in a vesicle in cell membrane are ejected from the cell

ex:hormone secretion