Cardiac & SKELETAL Muscle Cells

Which type of muscle tissue is found in the heart?

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

• Striated muscle

What is the role of contractile proteins in muscle fibers?

• To store energy

• To organize the cytoplasm

• To facilitate muscle contraction

• To transport nutrients

What is the main function of skeletal muscles?

• Pumping blood

• Aiding movement

• Digesting food

• Filtering waste

What are myofibrils composed of?

• Actin and myosin filaments

• Collagen fibers

• Elastin fibers

• Keratin filaments

What is the function of myofibrils during muscle contraction?

• They store energy

• They slide past each other

• They break down glucose

• They release hormones

What attaches a muscle to a bone?

• Ligament

• Tendon

• Cartilage

• Fascia

What is a muscle composed of?

• A single muscle fiber

• Many thousands of muscle fibers

• A few muscle fibers

• Only connective tissue

What spreads through the walls of the atria and ventricles?

• Blood vessels

• Cardiac muscle fibers

• Nerve fibers

• Fat tissue

What is the function of the sarcoplasmic reticulum (SR) in muscle fibers?

• To store calcium

• To produce ATP

• To connect muscle fibers

• To transmit electrical signals

What is the structure of cardiac muscle cells?

• They have multiple nuclei per cell.

• They are multinucleate.

• There is only one nucleus per cell.

• They have no nuclei.