Category: A

The absence of menses.  

The volume of air available for gas exchange; calculated as tidal volume minus dead space volume times frequency. The movement of air into and out of the alveoli. It is a function of the size of the tidal volume, the rate of ventilation, and the amount of dead space present in the respiratory system. It…

Resistance presented to the contracting ventricle. In cardiac physiology, the forces that impede the flow of blood out of the heart. The heart contracts against a resistance primarily composed of the pressure in the peripheral vasculature, the compliance of the aorta, and the mass and viscosity of blood.  

Either an increase or decrease in the efficiency of energy utilization. A physiological response of the body to adjust its metabolic rate to the presence of food.  

Reversal of polarity or change in electrical potential. A brief change in the electrical potential of an axon that is the physical basis of the nervous system impulse. Temporary change in electrical potential which occurs between the inside and the outside of a nerve or muscle fibre when a nerve impulse is sent. Change in…

The adaptive changes that occur when an individual undergoes prolonged or repeated exposure to a stressful environment; these changes reduce the physiological strain produced by such an environment. The biological process whereby an organism adapts to a new environment. This adaptation actually occurs on a molecular level. One example is when natural microorganisms adapt so…

A set exercise load performed at any intensity from just above resting to just below maximum.  

A narrowing of the valve opening between the lower left chamber of the heart and the aorta. A condition in which the aortic valve is narrow, caused by rheumatic fever. Narrowing or stricture of the aortic valve, due to congenital malformation or the result of disease (e.g., rheumatic fever), that obstructs the flow of blood…

A deficiency of oxygen, most frequently occurring when blood supply to any part of the body is completely cut off. Generally, lack of sufficient oxygen in the blood. Below-normal oxygen in body tissues. Lack of oxygen in blood or tissues; it may be local due to inadequate oxygen delivery to a localized area or may…

A deficiency of oxygen in the blood. A diminished or inadequate oxygen concentration in the blood. A condition in which there is less than the normal concentration of oxygen in the blood. Insufficient oxygenation of the blood. An insufficient supply of oxygen in the blood.