4.1- Muscle Roles and Types of Contraction 1 Quiz Please sign up for the course before taking this quiz. A muscle is behaving as an agonist when:1 It contracts while lengthening. The two ends of it move away from each other. It relaxes to initiate movement. It contracts to initiate movement. A muscle contraction is concentric when:1 The distance between the two ends of the muscle decreases. The distance between the two ends of the muscle increases. All muscle contractions are concentric. The distance between the two ends of the muscle stays the same. When a muscle is behaving as an agonist, it is:1 never contracted. It is not possible to know if an agonist is contracted without more information. always contracted. sometimes contracted. 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 agonist be located for that action?1Uttanasana to Ardha Uttanasana 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 Between the back of the upper arm and the back of the lower arm Between the back of the upper arm and the back of the shoulder When moving from the first pose to the second pose, what is the likely force that takes the back from being rounded to being more flat?1Uttanasana to Ardha Uttanasana Levitation An external force Leverage Gravity Wishful thinking When moving from the first pose to the second pose, what is the likely force that changes the shape of the neck?1Ardha Uttanasana to Uttanasana Humility Gravity Direct muscular control Leverage An external force