Question

Skeletal muscle will fail to contract due to antagonists binding to the receptor in:

A). Long term potentiation
B). All mechanisms of preventing skeletal muscle contraction rely on antagonists.
C). Myasthenia gravis
D). Botulism toxin

Answer 1

Skeletal muscle contraction can be inhibited by myasthenia gravis, where autoantibodies block ACh receptors, and botulinum toxin, which prevents ACh release from motor neurons. So, the correct answer is option c and d.

Step-by-step explanation:

Skeletal muscle will fail to contract due to antagonists binding to the receptor in myasthenia gravis and botulism toxin. To answer the question, in myasthenia gravis, autoantibodies block the receptors for acetylcholine (ACh) in muscle cells, leading to muscle weakness and paralysis.

In contrast, botulinum toxin works by preventing the release of acetylcholine from motor neurons at the neuromuscular junction, thereby inhibiting muscle contraction. Thus, the correct option is C) Myasthenia gravis and D) Botulism toxin.