Grade 12 Muscular System Worksheet
This worksheet covers the structure, function, and types of muscles in the human body, including muscle contraction and disorders, suitable for Grade 12 Biology students.
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Grade 12 Muscular System Review
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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?
Producing movement
Maintaining posture
Regulating body temperature
Producing blood cells
2. Which type of muscle tissue is responsible for involuntary movements like the pumping of blood?
Skeletal muscle
Cardiac muscle
Smooth muscle
Both b and c
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.
True
False
2. Muscle fatigue is primarily caused by the accumulation of lactic acid.
True
False
Match the term with its correct definition.
1. Sarcomere
a. Connective tissue surrounding a muscle fiber
2. Myofibril
b. Functional unit of muscle contraction
3. Endomysium
c. Rod-like unit of a muscle cell
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.