IB SEHS Topic 4.3

Opening the door by a handle is an example of....

• 1st class lever

• 2nd class lever

• 3rd class lever

Biceps curl is an example of...

• 1st class lever

• 2nd class lever

• 3rd class lever

The neurotransmitter stored in the axon terminal identified as #3

• Acetylcholine
• Protein Channel
• Calcium Ion (Ca²⁺)
• Syanptic Cleft

Tags

NGSS.MS-LS1-3

The organelle that contains actin and myosin.

• Tendon
• myofilament
• myofibril
• Fiber

What two chemicals are necessary for muscle contraction to occur?

• Niacin and Potassium
• Calcium and ATP
• Sodium and Potassium
• Ach and Potassium

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.

___ and ___ are regulatory proteins bound to actin. 

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

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

Tags

NGSS.MS-PS3-5

The image is an example of which class of lever?

• 1st
• 2nd
• 3rd

Which class of lever is shown by the diagram?

• 1st
• 2nd
• 3rd