The muscles that are active (either concentrically or eccentrically contracting) to control a movement (up or down) are referred to as the __
[ Select ]
neutralizers
stabilizers
agonists
antagonists
__. These muscles __
[ Select ]
concentrically
eccentrically
isometrically
__ contract as the weight is controlled in the downward phase of a movement.

Question

The muscles that are active (either concentrically or eccentrically contracting) to control a movement (up or down) are referred to as the __
[ Select ]
neutralizers
stabilizers
agonists
antagonists
 __. These muscles __
[ Select ]
concentrically
eccentrically
isometrically
 __ contract as the weight is controlled in the downward phase of a movement.

BlackTom AI · Accepted Answer

The question presents a multi-part fill-in-the-blank about muscle roles during movement, with three separate blanks to fill.

First blank options: neutralizers, stabilizers, agonists, antagonists.
- Neutralizers: These muscles cancel out unwanted actions of other muscles to refine movement, but they are not the primary movers controlling the movement itself.
- Stabilizers: These muscles are responsible for stabilizing joints or segments, providing a steady base, rather than actively driving the movement.
- Agonists: These are the primary muscles that produce the movement, i.e., the main movers that cause the joint to flex, extend, etc.
- Antagonists: These muscles oppose the action of the agonist, slowing or stopping the movement, not driving it.
In this context the statement refers to the muscles that are actively controlling the movement as the main movers, so the best fit is agonists, with neutralizers and stabilizers playing supportive roles, and antagonists opposing the action.

Second blank options: concentrically, eccentrically, isometrically.
- Concentrically: A concentric contraction shortens the muscle and typically drives the movement, but during the downward/control phase you are often resisting gravity, not primarily shortening to produce the movement.
- Eccentrically: An eccentric contraction lengthens the muscle while controlling the load, which is the common mechanism for controlling descent or downward phases by resisting the weight and providing braking/tempo control.
- Isometrically: An isometric contraction holds a position without changing muscle length, which does not describe the active control during a downward descent where lengthening can occur.
Given that the downward phase involves controlling the weight through a controlled lengthening, eccentric contraction is the appropriate description for these muscles.

Third blank options: concentrically, eccentrically, isometrically.
- If the muscles are controlling the downward phase by resisting the descent, they are contracting eccentrically (lengthening under tension).
- The other two options (concentric and isometric) do not match the typical mechanism for controlled lowering: concentric would shorten the muscle and drive the upward or lifting phase, while isometric would hold a position without allowing length change.

Putting it all together, the completed statements describe the muscles that act as agonists to drive the movement, contract eccentrically to control the downward phase, and thus the final fill-in would be: agonists, eccentrically, eccentrically. The explanations above show why each choice aligns or misaligns with the physiological roles during movement control.

2025FA-HES-207-001 A. Exam #3B - no lockdown

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