8826257
Description
Question 1
Question
The phospholipid bilayer is an insulator which cations cannot pass through, but anions can.
Answer
- True
- False
Question 2
Question
Choose the incorrect statement about ions and the RMP.
Answer
-
At RMP, concentration of Na+ is low inside the cell.
-
Normal ECF concentration of Na+ is 135-145mmol/L
-
At RMP, K+ concentration is high outside of the cell.
-
Normal ECF concentration of K+ 3.5-5mmol/L
Question 3
Question
The Na+/K+-ATPase pumps 3 Na+ out of the cell against their gradient and 2 K+ ions into the cell against their gradient.
Answer
- True
- False
Question 4
Question
Cells are at RMP the majority of the time.
Answer
- True
- False
Question 5
Question
Choose the incorrect statement.
Answer
-
At RMP, most Na+ channels are closed
-
At RMP, some K+ channels are closed
-
Na+/K+-ATPase is inactive
Question 6
Question
At RMP if more Na+ channels open, the cell becomes depolarised meaning it becomes more negative (-) in comparison to the ECF
Answer
- True
- False
Question 7
Question
Choose the correct statements.
Answer
-
At RMP K+ outflow is slightly larger than Na+ inflow
-
Na+ channels opening causes depolarisation up to +30mV
-
K+ channels opening causes repolarisation
-
Hyperpolarisation is due to Na+ channels closing before K+ gradient is fully established
Question 8
Question
Depolarisation is inhibitory, hyperpolarisation is excitatory.
Answer
- True
- False
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