When you inhale, you take in oxygen-filled air into your nose or mouth. The air then moves down this tube.
the trachea
100
What is the main job of the circulatory system?
THe main job of the circulatory system is to bring oxygen and nutrients to all the cells of your body. It also takes carbon dioxide and wastes away from the cells.
100
Where does digestion begin?
the mouth!
100
What does the excretory system do?
The job of the excretory system is to remove wastes and to maintain water balance.
100
The central organ of the circularoty system is the _______________.
the heart
200
The trachea divides into two main tubes called ________ which lead to the ___________.
bronchi and lungs
200
How many chambers are there in the human heart?
four
200
What does the digestive system do?
It breaks down food into smaller pieces the body can use.
200
How do the kidneys change the blood?
They filter the blood of urea and other waste products, and they help maintain water balance.
200
Saliva works to break down starch into ___________.
sugars
300
Why does air move in and out of the lungs so easily?
The reason is because your chest changes size.
300
What do the veins and arteries do?
Veins carry blood to the heart. This blood has little oxygen.
Arteries carry blood away from the heart.
300
When you finish chewing, food passes down a tube called the ___________ into the _____________.
esophagus, stomach
300
Where does urine go after it leaves the kidneys?
It flows down the ureters to the bladder. The bladder is a muscular bag that holds urine.
300
The ________ churns food, then passes it to the small intestine.
stomach
400
As oxygen diffuses from the _______ into the blood, carbon dioxide diffuses from the blood into the ______.
alveoli
400
What are capillaries? What is delivered through them?
Capillaries are tiny, very thin vessels connecting veins and arteries. Gases, sugars, minerals, and wastes pass through them.
400
The small intestine is lined with millions of tiny, fingerlike folds called __________.What do they do?
villi, nutrients from the digested food pass from the villi into the blood, then to every cell in the body!
400
What remedies help a kidney that has stopped working? (3)
medicines, dialysis, transplants
400
Where are your kidneys located?
near the middle of the back
500
Which muscles, located at the bottom of the chest, contracts and pulls downward while breathing?
diaphragm
500
Describe and compare the different chambers of the human heart?
Each atrium receives blood from the body. The ventricles pump blood to the body.
500
Describe the path food takes after it enters the mouth.
Food is chewed in the mouth. Chewed food is swallowed and travels down the esophagus. Food enters the stomach where it is mixed and stored. Food leaves the stomach as a soupy liquid.
500
How does the excretory system filter blood?
The kidneys pump out all of the liquid from the blood. Then nearly all of the liquid is returned to the blood. The portion of the blook that stays behind contains the wastes and becomes urine.
500
What are the three systems that remove wastes from the body, and what wastes do they remove?
respiratory system removes carbon dioxide from the lungs. The digestive system removes unused food as solid waste. The excretory system removes wastes from the blood.