By Faith Hickman Brynie

Asks and solutions questions about middle, blood, and circulatory approach. acceptable for center college, highschool, and non-physician adults. contains info on center motion, palpitations, middle assaults, leeches, transplants, blood chemistry, and the significance of nutrition, workout, and never smoking in preserve cardiovascular overall healthiness.

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In addition, some of the participants learned transcendental meditation. By uttering a word repeatedly, they entered a trancelike state that relaxes the body and slows the heart. Another group learned a method of relaxing muscles. After three months, the people who meditated had lower blood pressure than the controls who worked only on their lifestyles. The muscle relaxation group improved, too, although not as much as those who meditated. Biofeedback is another way of learning to control “involuntary” body processes.

Attachment depends partly on the hormone oxytocin produced in the hypothalamus. That same hormone floods the bloodstream of a new mother. It prompts her to fall • 35 • madly in love with her baby. Men make it too, but in smaller quantities. Evidence suggests that oxytocin strengthens emotional responses and makes memories of the loved one easier to retrieve while apart. Long-term relationships also boost levels of brain chemicals called endorphins. Endorphins are the body’s natural painkillers.

Aspirin molecules relieve headache or muscle pain because they bind to receptor sites in the brain, blocking pain messages carried through nerves. When the molecule breaks down or falls away from the receptor site, the brain again receives pain signals, and it may be time for another dose. How Does the Circulatory System Develop? About four weeks after egg and sperm unite and begin to develop in the uterus, an embryo’s heart starts to beat. But the heart is not fully formed. It begins as a simple tube, then divides into two chambers—an atrium and a ventricle.

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