Demonstration of Learning - Grade 7 Science

Which of the following best describes the primary function of the skeletal system in relation to movement?

• The skeletal system produces energy for muscle contractions during movement.

• The skeletal system releases hormones that regulate muscle growth and movement.

• The skeletal system stores fat and glucose for energy during physical activity.

• The skeletal system provides a rigid framework that supports muscles and allows them to work together for coordinated movement.

How does the muscular system work with the skeletal system to produce voluntary movement?

• The muscles contract and pull on bones at the joints, generating movement in specific directions based on muscle groups and body needs.

• The muscles relax to allow bones to move freely, while the skeletal system provides a source of energy for movement.

• Muscles secrete enzymes that allow the bones to bend and rotate in various directions.

• Muscles produce hormones that help the skeletal system adjust to changes in movement patterns.

How do the three types of muscle tissue (skeletal, smooth, and cardiac) work together to maintain overall body function?

• A. Cardiac muscles help with voluntary body movements, while skeletal and smooth muscles regulate internal processes like digestion.

• B. Skeletal muscles work independently to perform voluntary movements, while smooth and cardiac muscles collaborate to move the body as a whole.

• C. Skeletal muscles produce voluntary movements, cardiac muscles circulate blood, and smooth muscles control involuntary actions like digestion and blood flow.

• D. Skeletal, smooth, and cardiac muscles all function as part of the voluntary control system for body movement.

How do the skeletal and muscular systems work together to ensure efficient and controlled movement during complex activities, such as running or jumping?

• A. The skeletal system provides rigid levers for muscle contractions, which allows for efficient force transfer for movement.

• B. Muscles work in synergistic groups to stabilize bones, ensuring that excessive movement doesn't damage joints during high-impact activities.

• C. Ligaments and tendons contribute to the movement by generating electrical signals to activate muscles during physical activity.

• D. The skeletal system adjusts its rigidity dynamically to accommodate different types of muscle contractions and movement patterns.

The muscular and skeletal system of the human arm functions similarly to a spring-loaded door hinge. Which of the following best explains the role of muscles, bones, and joints in this comparison, including the terms biceps, triceps, elbow joint, and opposing forces?

• The biceps and triceps act as opposing forces, with the elbow joint functioning as the pivot point, similar to how a spring-loaded hinge operates.

• The biceps and triceps work together to push the arm forward, with the elbow joint acting as a locking mechanism.

• The bones in the arm are flexible like a spring, allowing for smooth movement at the elbow joint.

• The elbow joint is fixed, and the biceps and triceps do not interact, unlike a spring-loaded hinge.

Tags

NGSS.MS-LS1-3