Question

part 3: true or false (11 - 14)
write t for true or f for false.

1. smooth muscles are voluntary muscles.
2. cardiac muscle is found in more than one organ.
3. exercise helps strengthen muscles.
4. skeletal muscles are connected to bones.

part 4: short answer (15 - 17)
answer in 1 - 2 sentences.

1. explain how skeletal muscles work in pairs.

1. why does your heart beat faster when you exercise?

1. name the three main types of muscles.

Explanation:

• Question 11: Smooth muscles are involuntary. They function without conscious control, e.g., in the digestive tract.
• Question 12: Cardiac muscle is only in the heart. It has unique properties for continuous pumping.
• Question 13: Exercise stimulates muscle fiber growth. Resistance and aerobic exercises enhance strength and endurance.
• Question 14: Skeletal muscles attach to bones via tendons. This enables movement like limb extension.
• Question 15: One muscle contracts (agonist), the other relaxes (antagonist). For elbow bending, biceps contract, triceps relax.
• Question 16: Exercise increases oxygen demand. The heart beats faster to supply more blood (with oxygen) to muscles.
• Question 17: The three types are skeletal (voluntary, attached to bones), smooth (involuntary, internal organs), and cardiac (heart - specific, involuntary).

Answer:

1. F
2. F
3. T
4. T
5. Skeletal muscles work in pairs as one contracts (agonist) and the other relaxes (antagonist) to enable movement.
6. The heart beats faster during exercise to supply more oxygen - rich blood to muscles as exercise increases oxygen demand.
7. The three main types of muscles are skeletal, smooth, and cardiac muscles.