Chapter 10: Exam 3

What is one major function of muscle tissue?

• Storing fat

• Transmitting nerve impulses

• Producing movement

• Filtering blood

Which type of muscle tissue is voluntary and striated?

• Smooth muscle

• Cardiac muscle

• Skeletal muscle

• All of the above

What unique feature is found in cardiac muscle but not in skeletal muscle?

• Multiple nuclei

• Sarcomeres

• Intercalated discs

• Voluntary control

Which muscle type controls diameter in hollow organs like intestines?

• Skeletal

• Smooth

• Cardiac

• Voluntary

Which of the following is NOT a shared property of all muscle cells?

• Excitability

• Contractility

• Secretion

• Elasticity

What structure stores calcium in a muscle cell?

• Sarcolemma

• Sarcoplasm

• Sarcoplasmic Reticulum

• Myofibrils

What are the two main contractile proteins in a sarcomere?

• Myosin and Actin

• Troponin and Tropomyosin

• Titin and Myosin

• Actin and Collagen

Which structural protein provides elasticity to muscle fibers?

• Tropomyosin

• Myosin

• Titin

• Actin

In the sliding-filament mechanism, what causes the power stroke?

• Binding of calcium to myosin

• ATP hydrolysis by myosin head

• Detachment of myosin from actin

• Troponin blocking actin

What is the function of the sarcolemma?

• Stores calcium

• Encloses the muscle cell and conducts electrical signals

• Contracts the muscle fiber

• Connects sarcomeres together