Question

part 3: detailed interrelationships
read the \how it works\ sections carefully to describe how these systems rely on one another.

1. the energy chain: for you to have the energy to run, the digestive system must first break down food into a simple sugar called _____. the circulatory system then picks up this sugar from the ___ and pumps it through the blood to your muscular system so the muscles have _____ to move.
2. the oxygen delivery: the respiratory system brings oxygen into the lungs, but it cannot move through the body alone. the circulatory system uses a protein called _____, which is found in ___ blood cells, to grab that oxygen. if the nervous system (the brain) doesn’t receive this oxygen, it cannot send _____ to the rest of the body.
3. coordinated movement: when you want to move your leg, the nervous system sends an _____ ___ down the spinal cord to the muscle. this causes the muscular system to ___. because muscles are attached to the skeletal system by tough cords called _____, the contraction pulls on the bone to create movement.
4. safety & repair: when the skin is cut, the immune system immediately sends _____ cells to the site to kill ___. at the same time, the circulatory system sends ___ to the wound to help the blood _____ and form a scab.
5. structural protection: the skeletal system acts as a hard \cage\ for other systems. for example, the skull protects the fragile tissue of the _____ system, and the ___ ___ protects the heart and the organs of the _____ system.

Explanation:

Question 10

1. The digestive system breaks down food into glucose (a simple sugar).
2. The circulatory system picks up glucose from the small intestine (where nutrient absorption happens) and pumps it through the blood.
3. Muscles need energy (from glucose) to move.

1. Hemoglobin is the protein in red blood cells that carries oxygen.
2. The nervous system (brain) sends signals (like electrical impulses or nerve signals) to the body; without oxygen, it can't send these signals.

1. The nervous system sends an electrical signal (nerve impulse) down the spinal cord to muscles.
2. This signal causes muscles to contract.
3. Muscles are attached to bones by tendons.

Answer:

1. glucose
2. small intestine
3. energy

Question 11