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This number is considered normal if Exercise Anatomy 41 between 90 and 120 when taken in the arm. Blood pressure is lower at the capillaries to permit filtration without rupturing the delicate membrane walls. A diastolic blood pressure is the pressure in the vessels when the heart is relaxed in the cardiac cycle. Normal diastolic pressure is between 60 and 80 in the arm. A blood pressure of 120/80 is considered normal, and blood pressure of 140/90 is considered borderline high. High blood pressure can weaken the blood vessel walls and increase the risk of cardiovascular disease.

2 Parts of a bone. 2/350606/alw/r1-pulled tendons attach. The medullary cavity of the bone is a cavity in the center of the bone filled with yellow, fatty marrow. The endosteum is the layer of cells that line the medullary cavity. The rigid part of the bone is made of spongy and compact bone. The spongy bone is less dense and contains spaces so blood vessels and other nutrients can be supplied to the bone. The compact part of the bone contains few spaces and provides protection and strength. How Bones Grow The process through which bone grows in the body is called ossification.

This oxygen is critical in the production of energy used for sustained muscular contraction. Another important function of the respiratory system is to rid the body of carbon dioxide, a by-product of energy production, by exhaling it through the respiratory system in the opposite direction from which oxygen enters. 37). The upper respiratory tract consists of the parts located outside the chest cavity. These parts include the nose and nasal cavities as well as the upper trachea (the tube that connects the nasal passages to the lungs).