Question

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Answer 1

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17.

The heart is divided into four chambers consisting of two atria and two ventricles; the atria receive blood, while the ventricles pump blood. The right atrium receives blood from the superior and inferior vena cavas and the coronary sinus; blood then moves to the right ventricle where it is pumped to the lungs .

18.

• Transporting oxygen and nutrients to the lungs and tissues.
• Forming blood clots to prevent excess blood loss.
• Carrying cells and antibodies that fight infection.
• Bringing waste products to the kidneys and liver, which filter and clean the blood.
• Regulating body temperature.

19.

Blood comes into the right atrium from the body, moves into the right ventricle and is pushed into the pulmonary arteries in the lungs. After picking up oxygen, the blood travels back to the heart through the pulmonary veins into the left atrium, to the left ventricle and out to the body's tissues through the aorta.