05 Sliding Filament Theory Worksheet Quiz

1. The motor unit consists of muscle fibers and a ________________________________

• motor neuron

• sensory neuron

• blood vessel

• ligament

What neurotransmitter is needed to initiate a muscle contraction?

• acetylcholine

• dopamine

• serotonin

• norepinephrine

What substance causes the actin to change shape?

• calcium

• glucose

• oxygen

• potassium

How does myosin and actin interact with each other?

• Myosin heads bind to actin to form cross-bridges

• Myosin heads detach from actin to prevent muscle contraction

• Actin filaments break down myosin molecules

• Myosin and actin repel each other to cause relaxation

What substance provides the energy for muscle contraction?

• ATP

• Glucose

• Oxygen

• Lactic acid

Tags

NGSS.HS-LS1-7

Where is calcium released from?

• sarcoplasmic reticulum

• mitochondria

• nucleus

• ribosome

What is the gap between the neuron and muscle fiber called?

• synapse

• axon

• dendrite

• myelin sheath

What are the two filaments found in muscles?

• actin and myosin

• collagen and elastin

• keratin and fibrin

• tubulin and desmin

Place the steps in order: 1-5

(All right or all wrong)

• 5

• Cross bridges form

• 2

• Actin changes shape

• 3

• Calcium released from sarcoplasm

• 1

• Signal travels down the motor neuron

• 4

• ATP creates a power stroke, shortening actin filament

What does label 'a' represent?

• acetylcholine

• Synapse

• Motor Neuron

• arcoplasmic reticulum