Muscle Contractions

Multiple Choice

Skeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.

• Muscle cell

• Gland

• Neuron

• None of the above

Multiple Choice

___are thin filaments.

• troponin

• tropomyosin

• actin

• myosin

Multiple Choice

What is our current model of muscle contraction called?

• Fluid Mosaic Model

• Sliding Filament Theory

• Newton's Laws of Motion

• Big Bang Theory

Reorder

Reorder the following steps for muscle contractions from 1st to last step

• Ach is released across the synaptic cleft

• An electrical current travels down the sarcolmena

• The electrical current travels within the muscle fiber by the T-Tubles

• The sarcoplasmic reticulum releases calcium into the sarcoplasm

• Ca ions attach to troponin allowing the myofilaments to slide across one another

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Multiple Choice

What two chemicals are necessary for muscle contraction to occur?

• Niacin and Potassium

• Calcium and ATP

• Sodium and Potassium

• Acetylcholine and Potassium

Multiple Choice

What is the function of acetylcholine?

• ACh binds to receptors on the sarcolemma and opens ion channels

• ACh binds to receptors on the sarcolemma and closes ion channels

• ACh binds to ion channels and open them

• ACh binds to ion channels and closes them

Multiple Choice

What filament covers the actin and prevents the myosin head to attach to the actin (rope or strand shape).

• tropomyosin

• Myosin and actin

• Calcium and Oxygen

• troponin

Multiple Choice

A mitochondria's role in muscle contraction is the production of...

• Synthesis of ATP
• Metabolism of ATP
• Synthesis of Proteins
• Metabolism of Worn out Proteins

Multiple Choice

What is a crossbridge?

• Where myosin binds to actin

• Where the calcium crosses into the cytoplasm

• Where calcium binds with troponin

• Where titin and myosin are connected

Multiple Choice

When a muscle is relaxed and in a lengthened position, what is the relationship between actin filaments?

• They are on top of one another

• They are beside each other

• They are close to each other

• They are far apart from each other

Multiple Choice

The disease where a person no longer produces the protein dystrophin, causing their muscles to decrease. weaken, and disappear.

• ALS

• Muscular Dystrophy

• Myasthenia Gravis

• Tetanus

Multiple Choice

occurs when the connection between the nerves and muscle is lost

• muscle loss

• myasthenia gravis

• fibromyalgia

• involuntary hypotonicity

Open Ended

Reflection: Based on this lesson, what did you learn the most muscle contractions.