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What is the term for straightening a limb at a joint, increasing the angle between bones?

A.

adduction

B.

extension

C.

abduction

D.

flexion

Answer and Explanation

The Correct Answer is B

Rationale:
A. Adduction refers to moving a limb toward the midline of the body, not straightening a joint.
B.  Extension involves straightening a limb at a joint, which increases the angle between the bones, such as straightening the elbow or knee. This movement is essential for proper body mechanics and functional mobility.
C. Abduction involves moving a limb away from the midline of the body and does not increase the joint angle.
D. Flexion is the opposite of extension; it decreases the angle between two bones, such as bending the elbow or knee.


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Related Questions

Correct Answer is A

Explanation

Rationale:
A. The adult human skeleton typically consists of 206 bones, including the axial and appendicular skeletons. This total provides structural support, protection for vital organs, and facilitates movement.
B. 110 is too low and does not account for all bones in the adult skeleton.
C. 126 represents approximately the number of bones in the appendicular skeleton alone, not the entire body.
D. 80 corresponds roughly to the number of bones in the axial skeleton only, not the full adult skeleton.

Correct Answer is B

Explanation

Rationale:
A. Rectus femoris is one of the quadriceps muscles located in the anterior thigh, important for knee extension and hip flexion.
B. Deltoid is the large, triangular-shaped muscle covering the shoulder joint, responsible for abduction, flexion, extension, and rotation of the arm. This matches the pictured muscle.
C. Diaphragm is the dome-shaped muscle that separates the thoracic and abdominal cavities, playing a primary role in respiration.
D. Dorsogluteal refers to a site in the gluteal region (buttocks) commonly used for intramuscular injections, not a specific muscle.

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