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Zoo 3600 > Lecture 4 > Flashcards

Lecture 4 Flashcards

1
Q

Membrane Transport - Passive (overview)

A
  • no energy required
  • solute moves down the concentration gradient
  • Simple diffusion
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2
Q

Membrane Transport - Active (overview)

A
  • Uses ATP
  • Solute moves up concentration gradient
  • Primary active transport
  • Secondary active transport
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3
Q

Membrane Transport: Types

A
  • Simple Diffusion
  • Channel (facilitated diffusion - passive)
  • Carrier (facilitated diffusion - passive)
  • Active transport
  • Gradient (through the membrane)
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4
Q

The Kinetics of Facilitated Transport

A

The saturation kinetics of facilitated transporters follows a hyperbolic relationship
Ex. Michaelis-Menton Kinetics

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5
Q

Types of Transporters (1. Uniporter)

A
  • Glucose (RBC)
  • Na+ Channel
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6
Q

Types of Transporters (2. Antiporter)

A
  • Na+/K+ ATPase
  • Cl-/HCO3 - Exchanger
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7
Q

Types of Transporters (3. Symporter)

A
  • NKCC = Na+, K+, 2Cl- cotransporter
  • Symporter = Co-transporter
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8
Q

Aquaporins:

A

A family of membrane proteins that form channels specifically for the transport of water and small molecules

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9
Q

Aquaporins Functions

A
  1. Water regulation
  2. Kidney functions
  3. Plant physiology
  4. Cell signaling
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10
Q

Aquaporins Functions - 1. Water Regulation

A

Facilitate water movements in and out of cells. Maintaining cell tugor and overall fluid balance

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11
Q

Aquaporins Functions - 2. Kidney Functions

A

Vital to concentration urine and regulate water reabsorption⁷

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12
Q

Aquaporins Functions - 3. Plant Physiology

A

Help manage water in and out of body/roots

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13
Q

Aquaporins Functions - 4. Cell Signaling

A

Participate in signaling pathways and can transport other small molecules, such as glycerol or urea

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14
Q

Facilitated Diffusion - 1. Voltage-Gated channels

A

Open/close in response to changes in membrane potential

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15
Q

Facilitated Diffusion - 2. Ligand-Gated Channels

A

Open/close in response to presence/absence in ligand

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16
Q

Facilitated Diffusion - 3. Mechanically-Gated Cahnnels:

A

Open/close in response to changes in cell shape

17
Q

The Na+ - K Pump is Responsible for:

A
  1. Maintaining high {K+}in and {Na+}out
  2. Maintaining the transmembrane electrical potential

Zoo 3600 (9 decks)

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