Which of the Following Statements Is True Regarding the Extensor

question 29

Multiple Choice

Which of the following statements is true regarding the extensor mechanism of the fingers?

• A) Lumbricales and interossei allow active metacarpophalangeal (MCP)joint flexion,and proximal interphalangeal (PIP)and distal interphalangeal (DIP)joint extension.
• B) Extensor digitorum extends the PIP and DIP joints,but not the MCP joint.
• C) Lumbricales and interossei work to extend the MCP joint against the force of the long finger flexors.
• D) Extensor digitorum is the only muscle that can extend the DIP joint.

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Definitions:

Neurotransmitters

Chemicals found in the nervous system that transmit signals across a synapse from one neuron to another, influencing physical and psychological functions.

Synapse

A junction where information is transmitted from one neuron to the next in the nervous system.

Receptors

Specialized cells or structures in the body that respond to specific chemical, physical, or environmental stimuli.

Postsynaptic Dendrite

The part of a neuron that receives signals from other neurons at the synapse.