WEEK 9

Question 1

Name the three known members of the quadriceps from medial to lateral.

Answer 1

1. Vastus Medialis
2. Rectus Femoris
3. Vastus Lateralis

Question 2

Name the three members of the hamstrings from lateral to medial.

Answer 2

1. Biceps femoris
2. Emimembranosus
3. Semitendinosus

Question 3

What mysoin contraction is referred to as the forming of a “cross-bridge”?

Answer 3

Attachment of myosin with actin within the muscle cell.
Repeated attachment of actin and myosin within the cell

Question 4

If a muscle suffered an inability to produce sufficient ATP, what impact could this deficit have on muscle contraction?

Answer 4

Muscle function may decline
fatigue
soreness

Question 5

What are the three components that make up the Triad?

Answer 5

Pair of Terminal Cisternae
T-Tubules

Question 6

What role do voltage sensitive channels play in their interaction with the triad?

Answer 6

• Voltage sensitive channels release Calcium from the Cisternae - sarcoplasmic reticulum.
• Axon Terminal allows acetylcholine to be released

Question 7

What are the four steps of, “excitation-contraction coupling”?

Answer 7

1) generation of the muscle AP and depolarization of the T-tubule
2) release of ca++ from the sarcoplasmic reticulum
3) binding of ca++ to troponin and the initiation of the cross bridge cycle
4) re-accumulation of ca++ within the SR

Question 8

What is the body’s energetic molecule?

Answer 8

ATP

Question 9

Where is ATP made in the cell?

Answer 9

mitochondria

Question 10

What two molecules need to be delivered via the bloodstream to make the energy?

Answer 10

Oxygen - required for mitochondria to work
Nutrients

Question 11

Can we use other biomolecules as a potential energy source?

Answer 11

Yes.
CHO
Lipids
Protein