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A single muscle cell is called a

A.

muscle fiber

B.

fascicle

C.

myofibril.

D.

Myofilament

Answer and Explanation

The Correct Answer is A

Rationale:
A. Muscle fiber is the correct term for a single muscle cell. It is multinucleated and contains many myofibrils.
B. Fascicle is a bundle of muscle fibers surrounded by connective tissue (perimysium), not a single cell.
C. Myofibril is a subcellular structure within a muscle fiber made up of repeating sarcomeres; many myofibrils make up one muscle fiber.
D. Myofilament refers to the protein filaments (actin and myosin) within myofibrils that are responsible for contraction, not the entire cell.


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Related Questions

Correct Answer is {"dropdown-group-1":"B","dropdown-group-2":"B","dropdown-group-3":"A"}

Explanation

Rationale:
A. The human vertebral column is divided into regions: 7 cervical vertebrae in the neck, 12 thoracic vertebrae in the chest region (each articulating with a pair of ribs), and 5 lumbar vertebrae in the lower back. These vertebrae provide structural support, flexibility, and protection of the spinal cord.
B. This is incorrect because the cervical region has 7 vertebrae, not 5.
C. Incorrect, as both the cervical and thoracic counts are wrong.
D. Incorrect, because the lumbar region has 5 vertebrae, not 7.

Correct Answer is A

Explanation

Rationale:
A. Cyanosis refers to a bluish discoloration of the skin, lips, or nail beds due to inadequate oxygenation of the blood or poor circulation. It is often seen in conditions such as respiratory distress, heart disease, or hypothermia.
B. Refers to redness of the skin, usually caused by increased blood flow to the capillaries in response to fever, inflammation, infection, or sunburn.
C. Pallor refers to paleness of the skin, often due to reduced blood flow, anemia, shock, or hypothermia.
D. Jaundice refers to a yellow discoloration of the skin and eyes caused by elevated bilirubin levels, often due to liver dysfunction or bile duct obstruction.

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