Muscle Movement

Question 1

What is the endoskeleton made of?

Answer 1

bone and cartilage
it’s on inside of the body

Question 2

What is the exoskeleton made of?

Answer 2

Bone
hard and protective
On the outside of the body

Question 3

What is a joint

Answer 3

A site where to or more bones junction

Question 4

What is the main joint?

Answer 4

Synnovial joint

Question 5

What are features of a synnovial joint?

Answer 5

a fluid filled space between cartialage pads

Question 6

What type of joint is the hinge joint

Answer 6

ankle, knee, elbow

Question 7

What do hinge joints allow?

Answer 7

Only allow the movement of one axis(flexion and extension)
“forward and backward”

Question 8

what do ball and socket joints allow?

Answer 8

adduction abduction
flexion and extension
full circle rotation

Question 9

What is in the joint capsule?

Answer 9

Synovial fluid

Question 10

What is the ulna a lever for?

Answer 10

Triceps

Question 11

What is the radius a lever for?

Answer 11

biceps

Question 12

What is the humerous a lever for?

Answer 12

Shoulder muscles

Question 13

What does the joint capsule do?

Answer 13

It seals the joint space, provides stability by limiting movement

Question 14

What are flexor muslces?

Answer 14

Muscles that, when contracting, reduce the angle between s sides of a joint

Question 15

What are extensor muscles?

Answer 15

Muscles tht, when contracting, increase the angle between two joints

Question 16

When a bug’s leg bends, which muscle is used?

Answer 16

The one that looks like the hamstring

Question 17

Say the bones of the legs from furthest on the top to lowest.

Answer 17

Femur
Tibia
Tarsis

Question 18

What is the muscle version of mitochondria?

Answer 18

Sacromeres

Question 19

What are myofibrils?

Answer 19

Contractile fibres in the muscle

Question 20

What type of endoplasmic reticulum is in muscle?

Answer 20

sarcoplasmic reticulum.

Question 21

What is sarcolemma?

Answer 21

The membrane surrounding a single muscle fibre,

Question 22

What is a sacromere?

Answer 22

The segment between two neighboring Z lines (segment).

Question 23

Which is the actin and which is the myosin?

Answer 23

The actin is connected to the Z-line, myosin is not

Question 24

Which two proteins are responsible for muscl contraction?

Answer 24

Myosin and Actin.

Question 25

Explain muscle contraction.

Answer 25

Action potential from a motor neuron reaches the neuromuscular junction. This action potential causes the release of acetylcholine ( a neurotransmitter).

Acetylcholine triggers another action potential in the sarcolemma membrane. This travels down the Sacrolemma and T-tubule.

The action potential triggers the sarcoplasmic reticulum to open its Calcium channels. The calcium floods out and binds to proponin.

This causes troponin to move, not blocking the tropomyosin heads (binding sites) anymore.

The myosin head can now bind to the tropomyosin head forming a “cross bridge”. The myosin pulls the actin inwards “power stroke”.

ATP phosphorylates myosin head, breaking the cross bridge. The muscle relaxes and Calcium is pumped back into the Sarcoplasmic reticulum.