Question

1. when you do sit - ups, your rectus abdominus is the

a) insertion; origin c) antagonist; prime mover
b) origin; insertion d) prime mover; antagonist

1. how much atp is used in each myosin/actin cross - bridge cycle?

a) 1 c) 3
b) 2 d) 4

1. when you become out of breath and your muscles begin to burn during a workout, this is caused by

a) lack of calcium c) lack of oxygen
b) lack of water d) lack of acetylcholine

1. during rigor mortis, ____ floods the muscle fibers but a lack of ____ prevents them detaching.

a) calcium, atp c) oxygen, atp
b) atp, calcium d) atp, oxygen
matching. match the following terms to the correct description.

1. calcium a) essential to making plenty of atp in cellular respiration
2. atp b) myofilament that is essential to muscle contraction
3. sarcoplasmic reticulum c) outer membrane found around the belly of the muscle
4. oxygen d) covers each muscle fiber and conducts impulses
5. epimysium e) comes in from a nerve cell to remove molecules blocking acti
6. actin f) prepares a myosin head for its power stroke

labeling - diagram

1. h - band 24. m - line word bank
2. z - line 26. contracted

Explanation:

1. The rectus abdominis is the prime - mover for sit - ups, and the latissimus dorsi can act as an antagonist.
2. One ATP is used in each myosin/actin cross - bridge cycle.
3. Muscle burning and being out of breath during a workout are due to lack of oxygen, leading to anaerobic respiration.
4. During rigor mortis, calcium floods the muscle fibers, but lack of ATP prevents detachment.
5. Calcium comes in from a nerve cell to remove molecules blocking actin.
6. ATP prepares a myosin head for its power stroke.
7. The sarcoplasmic reticulum stores and releases calcium for muscle contraction.
8. Oxygen is essential to making plenty of ATP in cellular respiration.
9. The epimysium is the outer membrane found around the belly of the muscle.
10. Actin is a myofilament that is essential to muscle contraction.

For the labeling part, without seeing the specific labels on the diagram, we can't provide a detailed answer, but generally, the H - band is the region in the A - band that contains only thick filaments, the M - line is in the center of the H - band and holds the thick filaments together, and the Z - line marks the boundary of a sarcomere.

Answer:

1. d) prime mover; antagonist
2. a) 1
3. c) lack of oxygen
4. a) Calcium, ATP
5. e)
6. f)
7. (No specific answer given in options but stores/releases calcium)
8. a)
9. c)
10. b)