Anatomy - muscular system - types of muscle contraction

Question 1

does a muscle have to relax to lengthen?

Answer 1

no, a muscle can produce force at any length

Question 2

the two main divisions of muscle contractions relate to what?

Answer 2

whether the muscle length changes or not

Question 3

What are the two type of muscle contractions?

Answer 3

isotonic and isometric contractions

Question 4

what are the two types of isotonic contractions?

Answer 4

concentric/positive and eccentic/negative

Question 5

what is an isotonic contraction?

Answer 5

these cause the muscle to change length as it contracts and causes movement of a body part

e.g. bending an elbow to pull a weight up or performing squats

Question 6

what is a positive isotonic contraction?

Answer 6

the muscle shortens as it contracts (e.g. when you are bicep curling and raising the weight)

Question 7

what is a negative isotonic contraction?

Answer 7

the muscle lengthens as it contracts (e.g. when you are bicep curling and lowering the weight)

Question 8

what is an isometric contraction?

Answer 8

when there is tension but there is no change to the length of the contracting muscle

these are often to promote stability and endurance

e.g. a plank pose