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An extreme extension of a joint beyond its normally straight position is called

A.

adduction

B.

abduction

C.

hyperextension

D.

pronation

Answer and Explanation

The Correct Answer is C

Rationale:
A. Movement of a limb toward the midline of the body. It does not involve extending a joint beyond its normal position.
B. Movement of a limb away from the midline of the body. Like adduction, it does not describe joint extension.
C. Hyperextension refers to extending a joint beyond its normal anatomical position, such as bending the head backward too far or forcefully extending the knee past its straight alignment. While some hyperextension can be part of normal flexibility, excessive or forceful hyperextension can cause injury to ligaments and joint structures.
D. Refers to rotation of the forearm so that the palm faces downward or backward. It is a rotational movement, not an extension movement.


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Related Questions

Correct Answer is A

Explanation

Rationale:
A. The humerus is the long bone of the upper arm that extends from the shoulder to the elbow. It articulates proximally with the scapula at the glenoid cavity to form the shoulder joint and distally with the radius and ulna at the elbow joint. It serves as an important site for muscle attachment, allowing for a wide range of arm movements, and also houses the radial nerve and brachial artery along its course.
B. These are a group of eight small bones that form the wrist. They connect the forearm to the hand but are not located in the upper arm.
C. This is one of the two bones of the forearm, located on the lateral (thumb) side. It runs parallel to the ulna and articulates with the humerus at the elbow but is not part of the upper arm itself.
D. This is the second long bone of the forearm, located on the medial (pinky) side. It forms the hinge part of the elbow joint with the humerus, but like the radius, it is not an upper arm bone.

Correct Answer is D

Explanation

Rationale:
A. Refers to paleness of the skin, often caused by decreased blood flow, anemia, or shock. It is not redness.
B. Refers to a yellow discoloration of the skin and eyes, typically caused by liver disease or bile duct obstruction.
C. Refers to a bluish tint of the skin due to low oxygen levels in the blood.
D. Erythema describes abnormal redness of the skin caused by increased blood flow to the capillaries in the dermis, which may occur with inflammation, infection, fever, sunburn, or allergic reactions.

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