Exam 6: Muscle Physiology

____________________ is the intracellular signal for contraction.

Slow-oxidative fibres are type ____________________ fibres in the muscle.

Denervated muscle fibres become progressively smaller and their content of actin and myosin decreases.

Indicate which type of muscle is associated with the property in question by using the answer code (options may be used more than once or not at all). -basis of contraction is cross-bridge interaction between actin and myosin

What causes muscular fatigue?

Which of the following controls the conscious initiation of muscle contraction?

During an isotonic contraction of a muscle in the arm which of the following occurs?

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all). -has abundant glycolytic enzymes

Indicate which characteristic applies to which type of muscle by using the answer code (options may be used more than once or not at all). -load exceeds muscle tension

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all). -has the largest diameter

What provides the energy for cross-bridge cycling during muscle contraction?

Indicate which type of muscle is associated with the property in question by using the answer code (options may be used more than once or not at all). -has a clear-cut length-tension relationship

The two types of fast twitch fibres are interconvertible depending on the type of conditioning they receive.

If a muscle cell is excited,____________________ is released from the sarcoplasmic reticulum.

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all). -most resistant to fatigue

Which statement is correct for Actin?

Indicate which bands are being described in each statement by writing the appropriate letter(s) in the blank by using the answer code (options may be used more than once or not at all). -composed of thick filaments only

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all). -dark band

Which statement is FALSE?

The oxygen debt is the oxygen a skeletal muscle produces or pays off when it carries out glycolysis.