When a muscle fibre is stimulated, the calcium ions needed for contraction are released from the
Correct answer: D. sarcoplasmic reticulum
- A. mitochondria
- B. Golgi apparatus
- C. nucleus
- D. sarcoplasmic reticulum
Explanation
The sarcoplasmic reticulum stores calcium and floods the fibre with it when an impulse arrives along the T tubules. Mitochondria supply the ATP for contraction but not the calcium that triggers it.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Human Skeleton
The human skeleton provides support, protects organs, enables movement with muscles and stores minerals while bone marrow produces blood cells. Questions cover the axial and appendicular skeleton, types of bones and joints, cartilage, ligaments and tendons, and the difference between fixed, slightly movable and freely movable joints.
Practise Support and Movement
738 free Support and Movement MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Human Skeleton questions
The light band of the myofibril that contains actin but no myosin is the
ATP is required during muscle contraction for
The thick filaments of the sarcomere are composed mainly of the protein
A single motor neuron together with all the muscle fibres it supplies is called
The immediate reserve that regenerates ATP at the very start of vigorous muscle contraction is
The joints between the bones of the skull are