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individual muscle fibers
the total amount of force that a muscle can exert depends on the total number of _______ _________ ________ that have been stimulated
t/f: the distribution of melanin in the epidermis of the skin determines the color of an individual
t/f: cytotoxic t and be cells are activated by interleukin-2 which is secreted by helper t cells
t/f: when the body experiences a pathogen for the second time, the immune response is stronger and faster
t/f: fevers above 103 F can have beneficial effects when the body is defending itself against pathogens
immune surveillance by _______ ______ cells is one of the body's most potent defenses against cancer
an alarm signal is emitted by macrophages in the form of a protein called ________ which activates helper t cells
capillaries, arterioles, venules
_____, _______, and _______ are the blood vessels that connect the arteries to the veins
toward the throat/mouth to be swallowed or spat out
cilia of the trachea that beat continually propel contaminated mucus
the flap of elastic cartilage that protects food from entering the larynx when swallowing is the
exchange the air
the respiratory conducting passageways perform all of the following functions except
the _____ is a long straight tube that carries air from the back of the throat to the lungs.
when oxygen enters the respiratory system, what is the next structure to which it travels immediately upon leaving the trachea
the enlarged cup shaped closed end of the renal tubule that completely surrounds the glomerulus is called the
proximal convoluted tubule, loop of henle, distal convoluted tubule
starting from the glomerular capsule, the correct order of the renal tubule region is
salts, amino acids, glucose, urea
the filtrate removed from the blood by the kidneys might contain (4)
the most important stimulus for breathing in a healthy person is the body's need to rid itself of the blood gas called
the involuntary sphincter that keeps the urethra closed when urine is not being passed is called the
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