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MDCAT
Biology
2024

Biology · Gaseous Exchange

Work through this past-paper style MCQ, then read the full explanation. Practice more biology questions on mMCQ with adaptive practice and topic analytics.

Question

The pigment in the muscles responsible for the binding of oxygen is:

Options
  • A

    Oxyhemoglobin

  • B

    Plasmin

  • C

    Myoglobin

  • D

    Heme

  • E

    Hemoglobin

Explanation

Myoglobin is a protein found in muscle tissue that binds oxygen.

Oxyhemoglobin transports oxygen to tissues throughout the body, releasing it where it's needed for cellular respiration and energy production


Plasmin is an enzyme that plays a key role in the process of fibrinolysis, which is the breakdown of blood clots

Correct. Myoglobin is a muscle protein that stores and transports oxygen within muscle cells, helping supply oxygen during periods of high energy demand.

Heme is a complex molecule that contains an iron ion (Fe) at its center, surrounded by a porphyrin ring.

Hemoglobin is a protein found in red blood cells that binds and transports oxygen from the lungs to tissues throughout the body

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Tagged under Biology · Gaseous Exchange · 2024