Muscle System

Which connective tissue surrounds the whole muscle?

• epimysium

• endomysium

• perimysium

Which connective tissue surrounds individual muscle fibers?

• epimysium

• endomysium

• perimysium

Acetylcholine

• is a neurotransmitter

• helps the action potential jump the synaptic cleft

• opens sodium channels on the muscle

• All of these are true

Which chemicals must be present in the sarcomere for muscles to contract?

• calcium

• ATP

• lactic acid

• ATP and Calcuim

Which structure contains large amounts of calcium used for muscle? 

• sarcomere

• mitochondria

• sarcoplasmic reticulum

• myofibril

The sliding filament theory explains which of the following?

• muscle extensions

• muscle inductions

• muscle contractions

• muscle formation

What is the primary function of a tendon?

• Attach bone to bone

• Attach muscles to bones

• Attach muscles to organs

• Attach muscles to fascia

The gap between the nerve cell and sarcolemma is the ____ ___.

• Synaptic cleft

• Neurotransmitter

• Motor unit

• Neuromuscular junction

What is the specific neurotransmitter that stimulates the movement of skeletal muscles?

• GABA

• Acetylcholine

• Serotonin

• Dopamine

Once calcium is pumped into the presynaptic terminal what happens?

• The muscle contracts

• ACh is released into the synaptic cleft.

• Sodium pumps into the sarcolemma.

• The muscle contracts.