A nurse explains the role of calcium in skeletal muscle contraction. Which statement by the patient shows correct understanding?
Correct answer: B. Calcium binds to troponin and exposes binding sites
- A. Calcium blocks actin from binding to myosin
- B. Calcium binds to troponin and exposes binding sites
- C. Calcium breaks down acetylcholine in the synapse
- D. Calcium prevents ATP from being used by myosin
Explanation
Calcium binds to troponin, causing tropomyosin to move away from the active sites on actin. Myosin can then bind to actin and generate contraction using ATP. Acetylcholinesterase, not calcium, breaks down acetylcholine in the synaptic cleft.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Skeletal and Muscular Systems
The skeletal and muscular systems include bone structure, joints, cartilage, the axial and appendicular skeleton, and the roles of ligaments and tendons. They also cover skeletal muscle organization, the sliding filament mechanism, neuromuscular contraction, and common differences between voluntary skeletal muscle, cardiac muscle and smooth muscle.
Practise Skeletal and Muscular Systems
40 free Skeletal and Muscular Systems MCQs from Anatomy and Physiology for Nursing, 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 Anatomy and Physiology for Nursing questions like this
Anatomy and Physiology for Nursing is on 4 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 Skeletal and Muscular Systems questions
Which finding best distinguishes cardiac muscle from skeletal muscle?
A motor nerve impulse reaches the neuromuscular junction of a skeletal muscle fibre. Which event occurs first?
During skeletal muscle contraction, what happens to the actin filaments?
A patient has a suspected lower-leg fracture after a fall. The foot is pale and cool, and the dorsalis pedis pulse is absent. Which action should the nurse take first?
Which cell is primarily responsible for forming new bone tissue?
A patient has reduced production of blood cells after extensive damage to the marrow of long bones. Which tissue is most directly affected?