English textbooks

The heart’s electrical system The heart is a pump made up of muscle tissue. Like all muscles, the heart needs a source of energy and oxygen to work. The heart’s pumping action is controlled by an electrical system. This system organizes how…

How does the urinary system work? The body takes nutrients from food and changes them to energy. After the body has taken the food components that it needs, waste products are left behind in the bowel and in the blood.…

What is the nose? Your nose helps you to breathe and to smell. The inner part of the nose is above the roof of the mouth. The nose is made up of: External meatus. Triangular-shaped projection in the…

What is the central nervous system (CNS)? The central nervous system (CNS) is the brain and spinal cord. The brain is an important organ. It controls thought, memory, emotion, touch, motor skills, vision, breathing, temperature, hunger, and every process that…

Joints are the areas where 2 or more bones meet. Most joints are mobile, allowing the bones to move. Joints consist of the following: Cartilage. This is a type of tissue that covers the surface of a bone…

The skull may seem to be one large bone, but it’s made of several major bones that are connected together. The major bones that compose the skull include: 2 frontal bones 2 parietal bones …

Endometrium. The lining of the uterus. Uterus. Also called the womb, the uterus is a hollow, pear-shaped organ located in a person’s lower abdomen, between the bladder and the rectum. Ovaries. Two…

What is the central nervous system (CNS)? The CNS consists of the brain and spinal cord. The brain is an important organ that controls thought, memory, emotion, touch, motor skills, vision, breathing, temperature, hunger, and every process that regulates our…

Click Image to Enlarge The elbow is a hinge joint between the lower end of the humerus bone in the upper arm and the upper end of the radius and ulnar bones in…

The endocrine system is a complex network of glands and organs. It uses hormones to control and coordinate your body’s metabolism, energy level, reproduction, growth and development, and response to injury, stress, and mood. The following are key parts of the endocrine…

These are parts of the endocrine system: Hypothalamus. This gland is in the brain. It secretes hormones that stimulate or suppress the release of hormones in the pituitary gland. It also controls water balance, sleep, temperature, appetite, mood,…

Anterior chamber. The front section of the eye’s interior where aqueous humor flows in and out, providing nourishment to the eye. Aqueous humor. The clear watery fluid in the front part of the eye known as the anterior chamber. Blood…