Question

multiple choice question

what is myoglobin?

• a molecule that stores oxygen in muscles
• a carbohydrate that provides a muscle cell with energy
• an enzyme found in the synaptic cleft
• a hormone that triggers contraction

Explanation:

Identify the definition of myoglobin

Myoglobin is an iron- and oxygen-binding protein found in the skeletal muscle tissue of vertebrates. It serves as a local oxygen reservoir that provides oxygen to working muscles during periods of high metabolic activity.

Evaluate the given options

• A molecule that stores oxygen in muscles: This matches the physiological role of myoglobin.
• A carbohydrate that provides a muscle cell with energy: This describes glycogen, not myoglobin.
• An enzyme found in the synaptic cleft: This describes acetylcholinesterase, not myoglobin.
• A hormone that triggers contraction: Muscle contraction is triggered by neurotransmitters (like acetylcholine) and calcium ions, not a hormone called myoglobin.

Answer:

• A molecule that stores oxygen in muscles (Correct answer)
• A carbohydrate that provides a muscle cell with energy
• An enzyme found in the synaptic cleft
• A hormone that triggers contraction