BIO 210 Ch. 9-10 Quiz

Which protein primarily composes the thick filaments in muscle fibers?

• Actin

• Myosin

• Tropomyosin

• Troponin

What are T-tubules?

• T-tubules are invaginations of the plasma membrane in muscle cells that help transmit electrical signals.

• T-tubules are a type of protein found in the blood.

• T-tubules are a form of carbohydrate stored in the liver.

• T-tubules are a type of lipid found in cell membranes.

Which of the following skeletal muscle fiber arrangements are paired incorrectly?

• Biceps brachii - Parallel fascicles

• Pectoralis major - Convergent fascicles

• Rectus femoris - Bipennate fascicles

• Orbicularis oculi - Circular fascicles

Which type of muscle is striated and voluntary?

• Skeletal muscle

• Smooth muscle

• Cardiac muscle

Which muscle has dense bodies associated with it?

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

• Striated muscle

What are cross bridges?

• Cross bridges are connections between actin and myosin filaments formed during muscle contraction.

• Cross bridges are connections between DNA strands formed during replication.

• Cross bridges are connections between neurons formed during synaptic transmission.

• Cross bridges are connections between bones formed during ossification.

What cell has a RMP of -70 mV?

• Neuron

• Muscle cell

• Red blood cell

• Liver cell

Which of the following terms is defined as the specialized cell membrane of a muscle fiber?

• Sarcolemma

• Sarcomere

• Sarcoplasm

• Sarcoplasmic reticulum

How are muscle hypertrophy and atrophy different?

• Muscle hypertrophy is the increase in muscle size, while atrophy is the decrease in muscle size.

• Muscle hypertrophy is the decrease in muscle size, while atrophy is the increase in muscle size.

• Muscle hypertrophy and atrophy both refer to the increase in muscle size.

• Muscle hypertrophy and atrophy both refer to the decrease in muscle size.

What happens when muscles contract?

• Calcium combines with ATP to make a sarcomere

• actin produces myosin and ATP

• myosin attaches to actin-binding sites

• calcium creates contractions

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