Skeletal Muscle Contractions

Question 1

What are the Articulating bones of the knee?

Answer 1

Femur, tibia

Question 2

What are the Articulating bones of the hip?

Answer 2

Femur, pelvis

Question 3

What are the Articulating bones of the elbow?

Answer 3

Humerus, radius and ulna

Question 4

What are the Articulating bones of the wrist?

Answer 4

Radius, ulna and carpals

Question 5

What are the Articulating bones of the shoulder?

Answer 5

Humerus and scapula

Question 6

Name 8 bones in order.

Answer 6

cranium not skull

Question 7

Name 10 bones in order

Answer 7

Question 8

Name the 8 bones

Answer 8

Question 9

N—- I—— initiated in the M—- N—— cell body. N—- I—— is conducted down the A— of the M—- N—— by a nerve action potential.
N—- I—— has to cross the S——- C—-. N————— called A———— makes this happen by being secreted into the S——- C—-. If the E——– I——– is above the required threshold the M—– F—– will C——– at the same time with M——— F—-

Answer 9

NERVE IMPULSE initiated in the MOTOR NEURON cell body. NERVE IMPULSE is conducted down the AXON of the MOTOR NEURONE by a nerve action potential.
NERVE IMPULSE has to cross the SYNAPTIC CLEFT. NEUROTRANSMITTER called ACETYCHOLINE makes this happen by being secreted into the SYNAPTIC CLEFT. If the ELECTRICAL IMPULSE is above the required threshold the MUSCLE FIBRES will CONTRACT at the same time with MAXIMUM FORCE

Question 10

What are the Articulating bones of the knee?

Answer 10

Femur, tibia

Question 11

What are the Articulating bones of the hip?

Answer 11

Femur, pelvis

Question 12

What are tendons?

Answer 12

Fibrous connective tissue that attaches the muscle to the bone.

Question 13

Tendons

What do tendons do?
What is the origin?
What is the insertion point?

Answer 13

• Transmit force created by the muscle to move the bone
• Origin is where the muscle is attached to the stationary bone
• Insertion point is where the muscle attaches itself to the moveable bone which will get closer to the origin during muscular contraction

Question 14

What is a ligament?

Answer 14

Fibrous tissue that connects bones to bone

Question 15

What are motor neurons?

Where can the cell body be found?

Answer 15

• specialised cells which transmit nerve impulses rapidly to a group of muscle fibres.

The cell body can be found in:

• the brain
• the spinal cord with the axon branches connecting to the muscle fibres through the motor end plates

Question 16

Motor units (what are they and what are they responsible for)

Answer 16

• this is the term given to motor neurons and muscle fibres collectively.
• They are responsible for carrying the nerve impulse to the muscle fibres and initiating muscular contractions

Question 17

What is the neuromuscular junction?

Answer 17

the point at which the motor end plate meets the muscle fibres.

Question 18

What is the all or none law?

Answer 18

If the electrical impulse is above the required threshold the muscle fibres will contract at the same time and with maximum force