Grade 9 Science: Muscle Contraction Worksheet
Explore the fascinating process of muscle contraction with this Grade 9 science worksheet, covering the sliding filament theory, key proteins, and energy requirements.
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Grade 9 Science: Muscle Contraction
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Read each question carefully and answer to the best of your ability. Use complete sentences where required.
1. Which of the following is the primary energy source for muscle contraction?
Glucose
ATP
Oxygen
Lactic Acid
2. What is the name of the theory that explains how muscles contract?
Fluid Mosaic Model
Sliding Filament Theory
Cellular Respiration Theory
Lock and Key Model
3. Muscle fibers are composed of smaller units called , which contain contractile proteins.
4. The two main proteins involved in muscle contraction are actin and .
5. Briefly describe the role of calcium ions (Ca2+) in initiating muscle contraction.
6. During muscle contraction, the sarcomere shortens as the actin and myosin filaments slide past each other.
True
False
7. Observe the diagram of a muscle fiber cross-section below. Identify two key structures visible and briefly explain their function in muscle contraction.
Structure 1:
Function 1:
Structure 2:
Function 2: