What provides arteries with tensile strength?
a. elastin fibers
b. collagen fibers
c. glucosamine
d. smooth muscle
e. valves
b
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Which endocrine gland secretes calcitonin?
A. Pituitary B. Testes C. Thyroid D. Parathyroid
Match the following:
A) Lymph nodes B) Peyer's patches C) Spleen D) Lymph E) Thoracic duct 1) Protein-containing fluid within lymphatic vessels. 2) Stores blood platelets. 3) Receives lymph from most of the body. 4) Small organs intimately associated with lymphatic vessels. 5) Largest lymphatic organ. 6) Isolated clusters of lymph follicles found in the wall of the small intestine.
Which statement correctly compares passive and active transport?
A. Passive transport moves materials across the cell membrane without the use of energy while active transport moves materials across the cell membrane against the concentration gradient without the use of energy. B. Passive transport moves materials across the cell membrane with the use of energy while active transport moves materials across the cell membrane against the concentration gradient with the use of energy. C. Passive transport moves materials across the cell membrane with the use of energy while active transport moves materials across the cell membrane against the concentration gradient without the use of energy. D. Passive transport moves materials across the cell membrane without the use of energy while active transport moves materials across the cell membrane against the concentration gradient with the use of energy.
A child is born with a congenital disease that results in total loss of B cells. Which of the following would be a consequence of this immunodeficiency?
A. Inability to form any type of memory cell B. No antigens on the cells C. Lack of antibody formation D. No lymphokine production E. Nonfunctioning complement system