Breathing helps move blood from lower parts of the body toward the heart by which of the following mechanisms?
A) Inhalation increases the size of the thoracic cavity, which reduces pressure and draws blood toward the heart.
B) Inhalation decreases pressure in the abdominal cavity, which opens veins and pushes blood toward the heart.
C) Breathing does not help return blood to the heart.
D) Inhalation increases the size of the thoracic cavity and increases pressure in the abdominal cavity.
D
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An open system in which the growth rate is maintained by the removal and addition of media at such a rate as to maintain a constant cell density is called a
A. culturostat. B. chemostat. C. turbidostat. D. manostat.
When the interaction is detrimental to the population of both species (- -), it is referred to as ________
Fill in the blank(s) with correct word
What cytokine stimulates plasma cells to secrete IgA?
A) interleukin-5 B) interleukin-10 C) interleukin-4 D) interferon-gamma E) interferon-alpha
Large, flightless birds called __________ were exterminated from New Zealand by Maori natives before Europeans arrived.
A) dugongs B) dodos C) moas D) boas