Fast twitch muscle fibers have lower force production than slow twitch.     True   False

Embryonic myoblasts fuse to form single muscle fibers during development; thus skeletal muscle cells are multinucleated. True or False True False

Myosin are motor proteins that drive forces and movement on actin filaments.   true false

Tropomyosin covers the active sites on actin until it is ready for myosin to bond for a muscle contraction.     True   False

T-tubules are invaginations of the sarcolemma of a muscle cell. True or False True False

The skeletal muscle fiber arrangement that allows for more sarcomeres in series is better designed for _________________?     velocity of movement     cross-bridging     cross-sectional area     force production

Muscles relaxatiom occurs when acetylcholine is cleaved from its receptors ,calcium is pulled back into the sarcoplasmic recticulum,the myosin is released from its binding site ,and the muscle fiber returns to its resting lenght true or false

Why is sarcoplasmic hypertrophy a limitation with size training? It adds more actin and myosin. It decreases glycogen content of the muscle cell. It adds mass that is not able to produce force. It results in greater stores of intracellular fat.

Explain the requirements for Ca2+ and ATP in muscle contraction and relaxation.  Remember that myofibers are cells and have cellular metabolic requirements as well.

When motor units are recruited to participate in tension development in a muscle, the order of recruitment is typically: Question 13 options:   from slow twitch to fast twitch   from fast twitch to slow twitch   it depends on the type of contraction   related to the size and shape of the muscle