muscle part 2

Motor neuron attaches to the muscle fiber with its telodendria and axon terminals. This is called the ______________ __________

In excitation-contraction coupling, vesicles from somatic motor neuron perform exocytosis and release ___ to the synaptic cleft (causes action potentials in muscle cell)

• ACh

• NE

• calcium

The receptor for ACH is for the _________ _________ receptor

The binding of ACh in the________ ____ ________ to cholinergic nicotinic receptors cause sodium to rush in

When sodium rushes in the cholinergic nicotinic receptors it causes graded potentials. Before graded potentials, ACh is broken down by ________________

After graded potentials travel through sodium channels, what occurs next?

• action potentials in sarcolemma

• graded potentials in sarcolemma

• contractions

How does calcium get action potentials when the sarcolemma is not near their reach?

What is on the side of t tubules and stores calcium?

Answer explanation

action potentials occur here

When action potential occurs, calcium leaves the sarcoplasmic reticulum and goes to the...

• sarcoplasm

• cytoplasm

• myofibrils

Excitation-contraction coupling: after calcium leaves the sarcoplasmic reticulum and goes to the sarcoplasm, ______ now interacts w/ actin and myosin