Neuromuscular junction & Sliding Filament Theory (Quiz 4/21)

The energy needed to perform a muscle contraction comes directly from

• ATP
• Oxygen
• Glucose
• Calcium

What is a crossbridge?

• Where myosin binds to actin
• Where the calcium crosses into the cytoplasm
• Where calcium binds with troponin
• None of the answers are correct.

Calcium:

• causes ATP binding to actin
• increases the action potential along the sarcolemma
• binds to proteins on myosin
• triggers the binding of myosin to actin

Region where a motor neuron comes in close contact with a muscle cell.

• neurotransmitter
• muscular dystrophy
• muscle tension
• neuromuscular junction

What is the structure that stores the Calcium in the muscle cell.  

• Sarcoplasm
• Sarcolemma
• Sarcoplasmic Reticulum
• Myoglobin

___ and ___ are regulatory proteins bound to actin. 

• Troponin and tropomyosin
• Myosin and actin
• Calcium and Oxygen
• Glycogen and hemoglobin

Calcium binds to ___of the troponin-tropomyosin complex.

• troponin

• tropomyosin

• actin

• myosin

This is a neurotransmitter used to create a muscle impulse

• Acetylcholine
• Calcium Ions (Ca²⁺)
• Sodium Ions (Na⁺)
• Protein Channels

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

• Synaptic cleft

• Neurotransmitter

• Motor unit

• Neuromuscular junction

What is the name of the component that houses the neurotransmitters?

• Synaptic cleft

• Acetylcholine

• Receptors

• Synaptic vesicles