Homeostasis exists if concentrations of water, nutrients, and oxygen in the body are
balanced and heat and pressure _____.
A. decrease steadily
B. increase when the body is stressed
C. remain within certain limited ranges
D. fluctuate greatly between very high and low values - ANSWER C. remain...
Homeostasis exists if concentrations of water, nutrients, and oxygen in the body are
balanced and heat and pressure _____.
A. decrease steadily
B. increase when the body is stressed
C. remain within certain limited ranges
D. fluctuate greatly between very high and low values - ANSWER C. remain within certain
limited ranges
Which of the following are cellular fragments?
A. white blood cells
,B. blood platelets
C. lymphocytes
D. red blood cells - ANSWER B. blood platelets
Which of the nitrogenous bases is part of DNA, but not RNA?
A. thymine
B. cytosine
C. guanine
D. uracil - ANSWER A. thymine
Simple squamous epithelium is an example of a(n)
A. organ
B. tissue
C. organ system
D. molecule - ANSWER B. tissue
The isotope most likely to be used to study the thyroid gland is
A. iron-59
B. thallium-201
C. cobalt-60
D. iodine-131 - ANSWER D. iodine-131
Exposure to ultraviolet light darkens skin by stimulating synthesis of
, A. melanin
B. hemoglobin
C. cyanin
D. carotene - ANSWER A. melanin
A complete atom is electrically neutral because
A. the number of electrons is greater than the number of protons
B. the number of electrons equals the number of neutrons
C. the number of protons equals the number of neutrons
D. the number of electrons equals the number of protons - ANSWER D. the number of electrons
equals the number or protons
Which of the following characteristics of life and their descriptions is correct?
A. responsiveness - obtaining and using oxygen to release energy from food
B. assimilation - sensing changes inside or outside the body and reacting to
them C. circulation - the movement of substances in body fluids
D. respiration - changing absorbed substances into forms that are chemically different from
those that entered the body fluids - ANSWER C. circulation - the movement of substances in
body fluids
Histology is the study of
A. molecules
B. cells
C. tissues
D. organ function - ANSWER C. tissues
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