Sliding Filament Theory

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.

The energy needed to perform a muscle contraction comes directly from

• ATP

• Oxygen

• Glucose

• Calcium

Tags

NGSS.HS-LS1-7

Calcium binds to ___of the troponin-tropomyosin complex.

• troponin

• tropomyosin

• actin

• myosin

The neurotransmitter stored in the axon terminal identified as #3

• Calcium Ion (Ca²⁺)

• Protein Channel

• Acetylcholine

• Synaptic Cleft

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

• Sarcoplasm

• Sarcolemma

• Myoglobin

• Sarcoplasmic Reticulum

Place the following events in sequence:

A) Your arm moves

B) An impulse travels along a nerve

C) You decide you want to move your arm.

• A B C

• C B A

• C A B

• A C B

Which filament slides inward during muscle contraction

• Actin

• Myosin

Which of the following best describes the power stoke?

• actin's troponin pulls on the myosin filament

• myosin heads pull on binding sites of the actin filament

The gap between a neuron and a muscle cell: (#4 in the diagram)

• synaptic cleft
• sarcolemma
• vesicle
• Ca²⁺ ion

The organelle that stores ACh in the axon is identified as #4

• Motor Neuron
• Axon Terminal of Motor Neuron
• Sarcolemma
•  Vesicle