Muscle Power
How do the structures of the muscular and skeletal systems work together to produce movement?
Muscles pull on bones, allowing the body to move.
How does the structure of the skull support the survival of a human?
The skull protects the brain from injury.
What is the function of the digestive system, and how does it help the body survive?
It breaks down food so the body can absorb nutrients.
A student touches a hot surface and quickly pulls away. How does the nervous system help protect the body?
It processes sensory information and coordinates a quick response.
How does the circulatory system help the brain and muscles perform their functions?
Blood delivers oxygen and nutrients to the brain and muscles.
A student's arm muscles become tired after carrying a heavy backpack. What does this tell you about the function of muscles?
Muscles use energy to produce movement and can become fatigued.
Explain why muscles alone cannot provide the same support as muscles working with bones.
Bones provide structure and support for muscles to pull against.
Predict what might happen if food could not be broken down during digestion.
The body would have difficulty obtaining nutrients from food.
Describe how the body receives and responds to information when a ball flies toward a person's face.
The eyes detect the ball, the brain processes the information, and the nervous system coordinates movement.
A person's heart cannot pump enough blood during exercise. Predict how this could affect muscle function.
Muscles may not receive enough oxygen and nutrients to work effectively.
How do the brain and muscles interact when a person kicks a soccer ball?
The brain sends signals that cause muscles to contract.
How does the structure of the rib cage help protect the body?
The rib cage protects the heart and lungs.
Explain how the digestive and muscular systems interact.
Digestion provides nutrients that muscles use for energy and growth.
Predict what would happen if nerves could not carry signals to the muscles.
The person would have difficulty controlling movement.
A student claims that body systems function independently. Use evidence to explain why this claim is incorrect.
Body systems interact; for example, digestion provides nutrients and circulation transports them.
Predict what would happen if a person's muscles could contract but could not relax.
The person would have difficulty controlling movement.
A person breaks a leg bone. Predict how this injury could affect other body structures.
Movement may become difficult because the muscles and bones cannot work together normally.
Why must nutrients be absorbed into the body instead of simply passing through the digestive tract?
Nutrients are needed for energy, growth, and tissue repair.
The heart continues beating while a person sleeps. What does this demonstrate about how the body functions?
The body performs important functions automatically without conscious thought.
A person's digestive system breaks down food normally, but their circulatory system does not transport blood effectively. Why might the body's cells still lack the nutrients they need?
Nutrients may be absorbed but not delivered efficiently to cells.
When a person exercises, the heart beats faster. How does this change help the muscular system?
More blood circulates to deliver oxygen and nutrients to working muscles.
How do joints help the skeletal system perform its function?
Joints allow bones to move and bend in different directions.
A person's small intestine cannot absorb nutrients properly. Use cause-and-effect reasoning to predict how this could affect the body.
The body may not get enough nutrients to grow, repair tissues, or function properly.
How could damage to the brain affect a person's ability to balance and walk?
The brain helps coordinate information and muscle movements needed for balance.
Challenge: A student trips while running and scrapes a knee. Explain how at least four body structures or systems work together during this event and the recovery afterward.
The brain processes sensory information, muscles and bones support movement, the heart circulates blood, and blood delivers materials needed for healing.