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Anatomy & Physiology

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QuestionAnswer
What is the basic functional unit of a skeletal muscle fiber? The sarcomere, which contains actin and myosin filaments responsible for muscle contraction.
Which connective tissue surrounds individual muscle fibers? The endomysium.
What neurotransmitter triggers muscle contraction at the neuromuscular junction? Acetylcholine (ACh).
What is the role of calcium ions (Ca²⁺) in muscle contraction? Calcium binds to troponin, causing tropomyosin to move and exposing binding sites on actin.
Which joint type allows movement in only one direction, such as the knee or elbow? Hinge joint.
What type of joint allows the greatest range of motion? Ball-and-socket joint, found in the shoulder and hip.
What is the fibrous connective tissue that surrounds the entire muscle? The epimysium.
What is the difference between a tendon and a ligament? Tendons connect muscle to bone, while ligaments connect bone to bone.
What is the function of the sarcoplasmic reticulum? It stores and releases calcium ions (Ca²⁺) needed for muscle contraction.
What process links the electrical impulse in a muscle cell to the mechanical contraction? Excitation-contraction coupling.
Created by: user-1990694
 

 



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