Loss of body heat that occurs through submersion in cold water is an example of which of the following?
Evaporation
Convection
Conduction
Radiation
The Correct Answer is C
A. Evaporation is the process by which heat is lost as a liquid (like sweat) turns into a gas. This is not applicable in the case of submersion in cold water, as evaporation only occurs when moisture is on the skin and exposed to air.
B. Convection refers to the transfer of heat through the movement of air or fluids. While cold water can create a convection effect on the body, the primary heat loss in water is due to conduction rather than convection.
C. Conduction is the direct transfer of heat from one substance to another through physical contact. When the body is submerged in cold water, heat is lost to the water through conduction, as the colder water draws heat away from the body.
D. Radiation refers to heat loss through infrared radiation, typically when the body releases heat into the surrounding air. This is not the primary method of heat loss in cold water.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. After passing through the proximal convoluted tubule, the filtrate enters the Loop of Henle, where further reabsorption of water and solutes occurs. This is the next step in the nephron's sequence.
B. The collecting duct comes much later in the nephron pathway, receiving filtrate after the distal convoluted tubule. It is not the immediate successor to the proximal convoluted tubule.
C. The glomerulus is the site where blood filtration begins, preceding the proximal convoluted tubule, so the filtrate does not return here.
D. Bowman's capsule collects the initial filtrate from the glomerulus before it enters the proximal convoluted tubule, making it an earlier step in the nephron process.
Correct Answer is A
Explanation
A. The atrioventricular (AV) valves separate the atria from the ventricles. The right AV valve is called the tricuspid valve, and the left AV valve is the mitral valve. These valves ensure that blood flows from the atria into the ventricles without flowing back. This is the correct answer.
B. The pulmonary valve is located between the right ventricle and the pulmonary artery. It does not separate the atria and ventricles.
C. The aortic valve separates the left ventricle from the aorta and prevents blood from flowing back into the ventricle after contraction. It does not separate the atrial and ventricular chambers.
D. The semilunar valves, which include the pulmonary and aortic valves, are located at the exit of the ventricles but do not separate the atria from the ventricles.
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