The Muscular Love Story: Actin and Myosin

What are the names of the two tiny protein strands in muscle cells likened to famous lovers?

• Glucose and Fructose

• Actin and Myosin

• Keratin and Collagen

• Insulin and Glucagon

Which types of muscle tissue are mentioned?

• Rough, Cardiac, and Smooth

• Smooth, Cardiac, and Skeletal

• Skeletal, Smooth, and Elastic

• Cardiac, Elastic, and Rough

What is the role of ATP in muscle contraction?

• It functions as a muscle relaxant

• It serves as molecular currency providing energy

• It acts as a structural protein

• It is used as a neurotransmitter

What do the calcium ions bind to, causing a change that allows muscle contraction?

• Troponin

• Tropomyosin

• Myosin

• Actin

What is the sliding filament model of muscle contraction?

• The binding of calcium to myosin

• The process where actin and myosin slide past each other to shorten the muscle

• The breakdown of ATP to ADP

• The relaxation phase of the muscle

How many skeletal muscles are mentioned in the text?

• More than 700

• About 500

• Exactly 640

• Over 600

What triggers the calcium channels on the sarcoplasmic reticulum to open?

• The breakdown of ATP

• The binding of myosin to actin

• An action potential reaching the T-Tubules

• The release of acetylcholine

What is the primary function of the sarcoplasmic reticulum in muscle cells?

• To produce ATP

• To store and release calcium ions

• To synthesize proteins

• To transport oxygen

What happens when myosin binds to actin?

• The sarcomere contracts

• The sarcomere lengthens

• The muscle relaxes

• ATP is produced

What are the two main rules mentioned about proteins?

• They function as enzymes and hormones

• They like to change shape and bind/unbind with other stuff when stuff binds to them

• They only exist in muscle cells

• They are made up of nucleic acids