Vasopressin, or antidiuretic hormone, is secreted from the posterior pituitary in response to input from hypothalamic osmoreceptors which were activated by
a. increased levels of osmium in the blood.
b. softening of the cervical os (the outlet of the uterus).
c. increased plasma osmolarity.
d. increased blood volume.
e. increased blood pressure.
C
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Most of the skin is ________ mm thick.
A. 0.01 to 0.02 B. 1 to 2 C. 0.1 to 0.2 D. 10 to 20 E. 100 to 200
The epidermis of the skin is formed by multiple layers of flattened, irregularly shaped cells. The most superficial of these layers is filled with keratin. This type of epithelial tissue is classified as ________
A) stratified cuboidal epithelium B) keratinized stratified squamous epithelium C) simple squamous epithelium D) nonkeratinized stratified squamous epithelium
Which is not correct regarding B-lymphocytes?
A. Each B-lymphocyte responds to one particular antigen. B. They must be activated by helper T-lymphocytes, which present antigens to them. C. Memory B-lymphocytes may live for months or even years. D. Activated B-lymphocytes transform into plasma cells, memory B-lymphocytes, or NK cells. E. B-lymphocytes produce immunoglobulins.
Which of the following is most likely to occur when a soldier stands at attention--very still, with legs and spine straight?
A. decreased pressure in the capillaries of the feet B. increased absorption of interstitial fluid by the capillaries of the feet C. increased storage of blood in the veins of the feet and legs D. increased venous return E. increased blood flow to the brain