Unit 4 Muscle Contraction Quiz

Match each shape with the structure it indicates in the diagram

• Star

• a. axon of motor neuron

• Triangle

• b. neuromuscular junction

• Arrow

• c. acetylcholine (ACh)

• Circle

• d. sarcolemma

Which two are filaments that interact with one another to shorten the muscle during contraction?

• actin

• ATP

• sarcolemma

• myosin

Which of the following represents a contracted sarcomere?

• 
• 
• 
• 

Match each substance with its role in muscle contraction.

• K+ (Potassium)

• enters muscle cell to create action potential

• Acetylcholine (ACh)

• opens ion channels in the sarcolemma

• Ca2+ (Calcium)

• signals neuron to release acetylcholine

• Na+ (Sodium)

• leaves muscle cell to create action potential

Match each skeletal muscle structure with the shape that corresponds to it in the diagram

• Heart

• Endomysium

• Flower

• Perimysium

• Triangle

• Epimysium

• Arrow

• Fasicle

• Star

• Tendon

A model that explains how muscle contraction occurs at a molecular level.

• Krebs Cycle

• Sliding Muscle Theory

• Cell Theory

• Sliding Filament Theory

A protein located in the sarcoplasm of muscle fibers that acts as a storage unit for oxygen

• Hemoglobin

• Neuroglobin

• Myoglobin

• Cytoglobin

Fill in the Blank: After death, a lack of ATP results in a condition called _____ ______, where the muscles become stiff and immobile after death due to the lack of ATP.

Tags

NGSS.HS-LS1-7