Skeletons

Question 1

3 functions of a skeleton?

Answer 1

1. Support internal structure
2. Protects organs
3. Muscles contract and move bones

Question 2

3 types of skeletal systems and examples

Answer 2

1. Hydrostatic (soft-bodied animals, pressure of fluid) jellyfish
2. Exoskeleton (outer layer, made of chitin) snail
3. Endoskeleton (internal structures, bone/cartilage) human

Question 3

3 types of muscle

Answer 3

1. Smooth muscle (digestive system)
2. Cardiac muscle (heart)
3. Skeletal muscles (enable us to move)

Question 4

What are antagonistic muscles?

Answer 4

Muscles that are in pairs that work together to pull in opposite directions to move

Question 5

What is muscle fatigue?

Answer 5

Poisonous waste product (lactic acid) is made and causes pain and muscles stop working. Comes from muscle cells needing food from process of respiration

Question 6

Ligament’s function?

Answer 6

Attaches bone to bone

Question 7

Cartilage’s function?

Answer 7

Reduces friction + acts as shock absorber

Question 8

Tendon’s function?

Answer 8

Joins muscle to bone

Question 9

Synovial fluid’s function?

Answer 9

Allows bones to slide

Question 10

Synovial membrane’s function?

Answer 10

Produces synovial fluid

Question 11

3 main types of joint?

Answer 11

1. Fixed/immoveable (bind skull together after birth)
2. Slightly moveable (between ribs&breast bone allows chest to expand + contract during breathing)
3. Moveable (hips+shoulders - ball&socket and elbows+knees- hinge)

Question 12

Are longer bones stronger or weaker than shorter bones?

Answer 12

As the length of the bone decreases, the mass it can support increases