Which of the following is greater?
A) blood pressure when the peripheral vessels constrict
B) blood pressure when the peripheral vessels dilate
A) blood pressure when the peripheral vessels constrict
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Lymphocytes that destroy foreign cells or virus-infected cells are ________ cells
A) plasma B) B C) helper T D) cytotoxic T E) suppressor T
Answer the following statements true (T) or false (F)
1. The pituitary gland is housed in a saddlelike depression in the temporal bone called the sella turcica. 2. The ischium articulates with both the ilium and the pubis. 3. Hematopoiesis refers to the formation of blood cells within the red marrow cavities of certain bones. 4. Compact bone is replaced more often than spongy bone. 5. Bones are classified by whether they are weight bearing or protective in function.
Answer the following statements true (T) or false (F)
1. Dalton's law states that the total pressure exerted by a mixture of gases is the sum of the pressures exerted independently by each gas in the mixture. 2. Oxygenated hemoglobin releases oxygen more readily when the pH is more basic. 3. Nasal conchae mainly work on inhalation to warm and moisten air. They serve minor functions for exhalation. 4. Under certain conditions, the vocal folds act as a sphincter that prevents air passage. 5. Apneustic breathing is characterized by prolonged inspirations.
Recommended daily allowances established by the Food and Nutrition Board are based on
A. averages obtained from population studies. B. individual needs and factor in sex, age, and body mass.