Posted in Biology, Class 10, Human Body, Science

Human Heart

1. The heart is located in the center of the – chest, usually pointing slightly left.

2. The heart pumps blood through the blood vessels of the – Circulatory system

3. Heart is divided into – four chambers (upper left and right atria; and lower left and right ventricles)

4. Commonly the right atrium and ventricle are referred together – as the right heart and their left counterparts as the left heart.

5. The heart is enclosed in a – protective sac, the pericardium, which also contains a small amount of fluid

6. The wall of the heart is made up of – three layers (epicardium, myocardium, and endocardium)

7. Hear is supplying oxygen and nutrients to the – tissues and removing carbon dioxide and other wastes

8. A human heart is roughly the size of – a large fist

9. The heart weighs between about – 10 to 12 ounces (280 to 340 grams) in men and 8 to 10 ounces (230 to 280 grams) in women.

10. The heart beats about – 100,000 times per day (about 3 billion beats in a lifetime).

11. An adult heart beats about – 60 to 80 times per minute

12. The heart pumps about – 6 quarts (5.7 liters) of blood throughout the body

13. The heart has two sides, separated by an – inner wall called the septum.

14. The right side of the heart pumps blood to the lungs to pick up – oxygen

15. The left side of the heart receives the oxygen-rich blood from the lungs and pumps it to – the body

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