4.2- Muscle Roles and Types of Contraction 2 Quiz Please sign up for the course before taking this quiz. When a muscle is behaving as an antagonist, it is:1 always contracted. sometimes contracted. It is not possible to know if an antagonist is contracted without more information. never contracted. A muscle is behaving as an antagonist when:1 It lengthens to allow movement. It relaxes to initiate movement. It contracts to keep a joint from moving. It contracts to initiate movement. A muscle contraction is eccentric when:1 The distance between the two ends of the muscle stays the same. The distance between the two ends of the muscle increases. The distance between the two ends of the muscle decreases. All muscle contractions are eccentric. A muscle contraction is concentric when:1 The distance between the two ends of the muscle stays the same. The distance between the two ends of the muscle increases. The distance between the two ends of the muscle decreases. All muscle contractions are concentric. A muscle is behaving as an agonist when:1 It contracts while lengthening. It relaxes to initiate movement. It contracts to initiate movement. The two ends of it move away from each other. The main movement that takes the person pictured above from the first pose to the next one is that she straightens the elbows. Where would the antagonist be located for that action?1Uttanasana to Ardha Uttanasana Between the front of the upper arm and the front of the shoulder Between the back of the upper arm and the back of the lower arm Between the front of the upper arm and the back of the lower arm Between the front of the wrist and the front of the shoulder Between the front of the upper arm and the front of the lower arm In the transition from the 1st pose to the 2nd one, the knees bend. Where would the antagonists be for that action?1Tadasana to Utkatasana Between the fronts of the lower legs and the fronts of the upper legs. Between the backs of the lower legs and the backs of the upper legs. Between the front of the pelvis and the fronts of the upper legs. There is no antagonist in the bending of the knees in this transition. Between the top of the foot and the fronts of the lower legs. In the transition from the 1st pose to the 2nd one, the knees bend. What is the likely force that bends them?1Tadasana to Utkatasana Leverage Direct muscular control The power of the inhale An external force Gravity