Curriculum
Course: Cambridge AS & A Level Biology 9700 ...
Login

Curriculum

Cambridge AS & A Level Biology 9700 — Revision Notes

1 · Cell Structure

0/26

2 · Biological Molecules

0/51

3 · Enzymes

0/29

4 · Cell Membranes and Transport

0/41

5 · The Mitotic Cell Cycle

0/21

6 · Nucleic Acids and Protein Synthesis

0/22

7 · Transport in Plants

0/28

8 · Transport in Mammals

0/39

9 · Gas Exchange

0/13

10-11 · Infectious Disease and Immunity

0/43

12 · Energy and Respiration

0/37

13 · Photosynthesis

0/23

14-15 · Homeostasis and Control

0/57

16 · Inherited Change

0/34

17-18 · Selection, Evolution, Classification and Conservation

0/69

19 · Genetic Technology

0/44
Quiz

15.1.6 Transmission of Nerve Impulses – Exam questions

Submit quiz
Once you submit, you will no longer be able to change your answers. Are you sure you want to submit the quiz?
Cancel Submit
  • Questions count: 6
  • Passing grade: B+
Start Quiz
1.
A student described the transmission of a nerve impulse along a neuron as follows. In which step is the error? Step 1: At rest, the inside of the neuron is negative relative to the outside. Step 2: When stimulated, sodium channels open and Na+ enters the cell. Step 3: Then potassium channels open and K+ enters the cell. Step 4: The sodium-potassium pump restores the original ion distribution.
Step 1
Step 2
Step 3
Step 4
2.
Depolarisation is caused by:
K+ diffusing out
Na+ diffusing in
Cl− diffusing in
The Na+/K+ pump
3.
The refractory period ensures that:
Impulses travel in one direction
Action potentials are larger
Myelin forms
Na+ channels stay open
4.
Saltatory conduction occurs because:
Axons are wider
Temperature is higher
Myelin restricts depolarisation to nodes of Ranvier
K+ channels are absent
5.
Which statement best describes Depolarisation?
A reduction in the potential difference across a membrane, caused by Na+ entering the axon.
Jumping of the action potential between nodes of Ranvier, increasing conduction speed.
An insulating layer formed by Schwann cells that allows saltatory conduction.
A cell specialised to transmit electrical impulses.
6.
Which statement best describes Action potential?
The minimum depolarisation (about −55 mV) needed to trigger an action potential.
A reduction in the potential difference across a membrane, caused by Na+ entering the axon.
The return of the membrane potential towards resting value as K+ leaves the axon.
A rapid, temporary reversal of membrane potential (to about +40 mV) that travels along an axon.
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
Part of 14-15 · Homeostasis and Control — see every lesson and quiz in this unit.
Accepted payment methods