Question

an individual picks up a cup and drinks from it. this is an example of _______.
a. a concentric contraction because muscles cause the elbow joint and arm to move
b. an eccentric contraction because the release of the muscle in the back of the arm causes the elbow to bend
c. an isometric contraction because the cup was stationary until the hand picked it up
d. a midcentric contraction because the movement took place around the core of the body

please select the best answer from the choices provided.

a
b
c
d

Explanation:

To solve this, we analyze each option:

• Option A: Concentric contraction occurs when a muscle shortens to produce movement (like bending the elbow to lift a cup). The biceps shorten to move the arm/elbow, so this fits.
• Option B: Eccentric contraction is muscle lengthening (e.g., lowering a cup), not lifting. So B is incorrect.
• Option C: Isometric contraction is when muscle tension changes but length doesn't (no movement, just holding). Lifting the cup involves movement, so C is wrong.
• Option D: "Midcentric contraction" is not a standard muscle contraction type. So D is incorrect.

Answer:

A. a concentric contraction because muscles cause the elbow joint and arm to move