Grade 12 Muscular System Worksheet

Grade 12 Muscular System Review

Read each question carefully and provide your best answer. For multiple-choice questions, circle the letter corresponding to the correct answer. For fill-in-the-blanks, write the appropriate term on the line provided. For short-answer questions, use the space given to explain your answer.

The Human Muscular System:

1. Which of the following is NOT a primary function of the muscular system?

2. Which type of muscle tissue is responsible for involuntary movements like the pumping of blood?

1. The sliding filament model of muscle contraction involves the interaction between actin and   filaments.

2. The neurotransmitter responsible for initiating muscle contraction at the neuromuscular junction is  .

3. A sustained, forceful muscle contraction without relaxation is known as  .

1. Briefly explain the role of ATP in muscle contraction and relaxation.

2. Differentiate between isotonic and isometric muscle contractions, providing an example for each.

1. Skeletal muscles are always attached to bones by tendons.

2. Muscle fatigue is primarily caused by the accumulation of lactic acid.

Match the term with its correct definition.

Discuss the process of excitation-contraction coupling in skeletal muscle, starting from the arrival of an action potential at the neuromuscular junction to the initiation of muscle contraction. Include the roles of key structures and ions.