Is actually for anatomy involving muscles. multiple questions

1. what part of the sarcomere is reponsible for providing the ATP?
a) actin
b) mitochondria
c) myosin

2. what actually shortens when a muscle fiber contracts?
a) actin filaments
b) myosin filaments
c) sarcomeres

3. the protein of the skeletal muscle involving ATPase (the breakdown of ATP) is
a) myosin
b) tropmyosin
c) actin

4. which grouping of muscle constituents are listed correctly in descending order of size?
a) fasciculus, muscle fiber, myofibril, actin-myosin, myofilament
b) muscle fiber, fasciculus, myofibril, myofilament
c) fasciculus, muscle fiber, myofibril, myofilament, actin-myosin

5. a group of skeletal muscle fibers is called a/an
a) perimysium
b) fascicle
c) epimysium

if you could answer any or all of these it would be greatly appreciated.

1. Myosin in the sarcomere is responsible for providing the ATP

2. Sarcomeres shortens when a muscle fiber contracts

3. Myosin is the protein of the skeletal muscle involving ATPase

4. Fasciculus, muscle fiber, myofibril, myofilament, actin-myosin is the descending order of size of muscle constituents

5. Fascicle is a group of skeletal muscle fibers

Explanation:

The head of myosin filaments in sarcomeres can bind with ATP and hydrolyze it to provide energy for sliding of filaments during muscle contraction.

The sarcomeres (the I band) of the muscle cells shorten during muscle contraction; while the actin and myosin filaments slide against each other to shorten the sarcomere

Myosin is a motor protein present in skeletal muscles that hydrolyzes ATP with the enzyme ATPase at its head.

Fasiculus is a bundle of muscle fibers. Each muscle fiber is made up of myofibrils with myofilaments called actin and myosin.

Fascicle refers to a group of skeletal muscle fibers bundled together and covered by connective tissues. These are bundled according to the type of movements they are involved.

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