Q:

A skeletal muscle fibre

safaTerkawi
Save to bookmark
|
2022-08-09
|
  95 
0

 A skeletal muscle fibre.

  1. Membrane is negatively charged on the inside with respect to the outside at rest.
  2. Contains intracellular stores of calcium ions.
  3. Is normally innervated by more than one motor neurone.
  4. Becomes more excitable as its resting membrane potential falls.
  5. Becomes less excitable as the extracellular ionized calcium levels fall.
Medicine, textbook solutions, MCQ Questions, Medicine textbook-solutions, Medicine MCQ-questions,
login and add your own answer to this question

All Answers

safaTerkawi
2022-08-09
need an explanation for this answer? contact us directly to get an explanation for this answer

  A. True This ‘resting membrane potential’ is about -90 mV.

B. True These are released on excitation.

C. False A single neurone supplies a group of muscle fibres.

D. True It becomes more excitable as its membrane potential approaches the firing threshold (about -70 mV).

E. False Decreasing extracellular Ca2+ increases excitability and may lead to spontaneous contractions (tetany), possibly by increasing sodium permeability.

need an explanation for this answer? contact us directly to get an explanation for this answer

total answers (1)

Similar questions

need a help?

find thousands of online teachers now