MUSCLE CONTRACTIONS

Question 1

What pairs do muscles act in

Answer 1

Antagonistic pairs

Question 2

What is the skeletal muscle

Answer 2

Skeletal muscle (also calle d striated, striped or voluntary muscle) is the type of muscle you use to move, e.g. the biceps and triceps move the lower arm.

Question 3

What are skeletal muscles attached to

Answer 3

Skeletal muscles are attached to bones by tendons

Question 4

What do ligaments do

Answer 4

Ligaments attach bones to other bones, to hold them together

Question 5

What do pairs of skeletal muscles contract and relax to do

Answer 5

Pairs of skeletal muscles contract and relax to move bones at a joint. The bones of the skeleton are incompressible (rigid) so they act as levers, giving the muscles something to pull against.

Question 6

What are muscles that work together to move a bone called

Answer 6

Antagonistic pairs

Question 7

What is the contracting muscle called

Answer 7

The agonist

Question 8

What is the relaxing muscle called

Answer 8

Antagonist

Question 9

What are the bones of your lower arms attached to

Answer 9

The bones of your lower arm are attached to a biceps muscle and a tric e ps muscle by tendons.

Question 10

How do biceps and triceps work together to move your arm

Answer 10

The biceps and triceps work together to move your arm — as one contracts, the other relaxes.

Question 11

What happens when your bicep contracts

Answer 11

W h en your biceps co ntracts your triceps relaxes. This pulls the bone so your arm bends (flexes) at the elbow. Here, the biceps is the agonist and the trice ps is the antagonist.

Question 12

What is the skeletal muscle made up of

Answer 12

Long muscle fibres

Question 13

What do muscles act as

Answer 13

effectors and are stimulate d lo c o n tra c t by neurones

Question 14

What is the skeletal muscle made up of

Answer 14

Skeletal muscle is made up of large bundles of long cells, calle d muscle fibres

Question 15

what is the sarcolemma

Answer 15

The ce ll membrane of muscle fibre ce lls

Question 16

What are transverse tubules and what do they do

Answer 16

Bits of the sarcolemma fold inwards across the muscle fibre and stick into the sarcoplasm (a muscle c ell’s cyto plasm). Bits of the sarcolemma fold inwards across the muscle fibre and stick into the sarcoplasm (a muscle c ell’s cyto plasm)