The main pacemaker of the heart is the __________.
Fill in the blank(s) with the appropriate word(s).
SA Node
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The nerve immediately inferior to the 12th rib is the
A) 12th intercostal or thoracic nerve B) abdominal nerve. C) sciatic nerve. D) phrenic nerve. E) ilioinguinal nerve.
What is the connection between breathing and venous return?
A) Inhalation decreases pressure in the pleural cavity, thus more blood flows into the inferior vena cava. B) Inhalation increases pressure in the pleural cavity, thus more blood flows into the inferior vena cava. C) Exhalation decreases pressure in the pleural cavity, thus more blood flows into the inferior vena cava. D) Both inhalation and exhalation increase pressure in the pleural cavity, thus less blood flows into the inferior vena cava. E) Both inhalation and exhalation decrease pressure in the pleural cavity, thus less blood flows into the inferior vena cava.
Anabolic steroids are variants of the male sex hormone ____
a. estrogen b. progesterone c. testosterone d. prolactin
What is the role of ATP in the cell?
What will be an ideal response?