Membrane & transport

Question 1

Types of gated channels?

Answer 1

Voltage gated, chemically gated and mechanically gated

Question 2

Voltage gated?

Answer 2

sensor stimulated by electrical stages of the cell (changes of ion conc)

Question 3

Chemically gated?

Answer 3

sensor stimulated by intracellular messenger molecules or by an extracellular ligand.

Question 4

Mechanically gated?

Answer 4

sensor stimulated by physical change such as increased temp or pressure

Question 5

Endocytosis?

Answer 5

energy using process

cell absorbs molecule by engulfing them

Question 6

exocytosis?

Answer 6

cell directs contents of secretory vesicles out of cell membrane into extracellular space

Question 7

Carrier proteins?

Answer 7

Transports larger molecules like glucose and nucleotides than channel. Slower than channel. No direct connection between extra and intracellular environments.

Question 8

Active transport Na+/K+ pump?

Answer 8

3Na out when ATP binds and 2K in when ATP detaches

Question 9

Hypo solution compared to hyper solution?

Answer 9

hypo - sol with lower conc of osmotically active particles than inside cell

hyper - higher sol conc