Crash Course: Muscles Part 1

What are the three types of muscle tissue mentioned in the video?

• Smooth, cardiac, and skeletal

• Rough, cardiac, and skeletal

• Smooth, cardiac, and fibrous

• Rough, fibrous, and skeletal

Where is smooth muscle tissue primarily found?

• In the heart

• In the walls of hollow visceral organs

• In the skeletal muscles

• In the skin

What are the two types of myofilaments found in sarcomeres?

• Actin and myosin

• Collagen and elastin

• Keratin and fibrin

• Tubulin and dynein

What is the function of T-tubules in muscle cells?

• They store calcium ions.

• They transport action potentials deep into the cell.

• They produce ATP.

• They synthesize proteins.

What type of channels are linked to calcium channels in muscle cells?

• Voltage-gated sodium channels

• Ligand-gated potassium channels

• Voltage-gated calcium channels

• Ligand-gated sodium channels

What protein does calcium bind to, causing a change in shape?

• Myosin

• Actin

• Troponin

• Tropomyosin

What happens when myosin binds to actin?

• The muscle relaxes

• The muscle contracts

• The muscle elongates

• The muscle disintegrates

What happens when calcium unbinds from troponin?

• The muscle contracts

• The muscle relaxes

• The muscle elongates

• The muscle disintegrates

What type of muscles use the sliding filament model to create movement?

• Smooth, cardiac, and skeletal muscles

• Only cardiac muscles

• Only skeletal muscles

• Only smooth muscles

What analogy is used to describe the construction of skeletal muscles?

• A bridge

• A rope

• A ladder

• A web