Question

question 1 1 pts a contraction in which muscle length remains the same but muscle tension increases is called an isometric contraction. isotonic contraction. isokinetic contraction. isometric contraction and an isotonic contraction. question 2 1 pts the contractile unit of a muscle cell is the actin. myosin. myofibril. sarcomere. question 3 1 pts ____ occurs when the foot is tilted upward, thus decreasing the angle between the top of the foot and the front of the leg. plantar flexion dorsiflexion extension supination

Explanation:

• Question 1: In an isometric contraction, muscle length stays the same while tension increases. In isotonic contraction, muscle length changes. Isokinetic contraction involves a constant speed of contraction.
• Question 2: The sarcomere is the basic contractile unit of a muscle cell. Actin and myosin are proteins within the sarcomere and myofibrils are made up of sarcomeres.
• Question 3: Dorsiflexion is the movement where the foot is tilted upward, decreasing the angle between the top of the foot and the front of the leg. Plantar - flexion is the opposite movement. Extension generally refers to straightening a limb, and supination is a rotational movement.

Answer:

• Question 1: isometric contraction
• Question 2: sarcomere
• Question 3: Dorsiflexion