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Any student who wishes to master biology has to start somewhere; best starting point always ensure a clear path for success in your competitive exams, both NEET and KVPY is NCERT BOOKS FOR BIOLOGY CLASS 12. The best ...

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Nutrition is the study of nutrients and how the body utilizes them. Nutrients (nu′tre-ents) include carbohydrates, lipids, proteins, vitamins, minerals, and water. Carbohydrates, lipids, and proteins are called macronutrients because they are required in large amounts. They provide energy as well ...

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The heart chambers function in a coordinated fashion. Their actions are regulated so that atria contract, called atrial systole (sis′to-le), while ventricles relax, called ventricular diastole (di-as′to-le); then ventricles contract (ventricular systole) while atria relax (atrial diastole). Then the atria and ventricles both ...

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Structure of the Heart The heart is a hollow, cone-shaped, muscular pump. It lies within the thoracic cavity and rests on the diaphragm. Size and Location of the Heart Heart size varies with body size. An average adult’s heart is about 14 centimeters ...

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Internally, the heart is divided into four hollow chambers—two on the left and two on the right. The upper chambers, called atria (a′tre-ah; singular, atrium), have thin walls and receive blood returning to the heart. Small, earlike projections ...

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The Heart: The heart pumps 7,000 liters of blood through the body each day, contracting some 2.5 billion times in an average lifetime. This muscular pump forces blood through arteries, which connect to smaller-diameter vessels called arterioles. Arterioles branch into the tiniest ...

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