Grade 10 Science: Muscle Contraction
This worksheet covers the fundamental mechanisms of muscle contraction, including the sliding filament theory, the role of key proteins, and the neuromuscular junction, suitable for Grade 10 science students.
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Muscle Contraction Worksheet
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Read each question carefully and answer to the best of your ability. Show all your work where applicable. Good luck!
1. Which of the following is the primary energy source for muscle contraction?
Glucose
ATP
Oxygen
Lactic Acid
2. Which ion is essential for initiating the binding of myosin to actin?
Sodium (Na+)
Potassium (K+)
Calcium (Ca2+)
Chloride (Cl-)
1. The functional unit of a muscle fiber is called a .
2. According to the theory, muscle contraction occurs when actin and myosin filaments slide past each other.
1. Tropomyosin covers the myosin-binding sites on actin in a relaxed muscle.
True
False
2. A motor neuron releases acetylcholine at the neuromuscular junction.
True
False
1. Briefly explain the role of ATP in muscle contraction.
Study the diagram below showing a cross-section of a muscle fiber, then answer the following question.
2. Identify the structures labeled 'A' and 'B' in the diagram and describe their function during muscle contraction.
Match the term on the left with its correct definition on the right.
1. Sarcolemma
a. Stores calcium ions
2. Sarcoplasmic Reticulum
b. Cell membrane of a muscle fiber
3. Myosin
c. Thick filament protein