Embryonic stem cells growing in a lab dish are bathed in a "cocktail" of chemicals that
cause them to specialize into branching networks of single-nucleated cells that pulsate in
unison. This tissue is most likely
A) skeletal muscle. B) cardiac muscle.
C) epithelial tissue. D) smooth muscle.
B
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A neuron in the skin detects tissue damage in the skin during a burn and informs the brain and spinal cord. This neuron is part of the ________ pathway.
Fill in the blank(s) with the appropriate word(s).
The hepatic portal vein ________.
A) is actually an artery B) carries nutrient-rich blood to the liver C) carries oxygen-rich blood from the liver to the viscera D) carries blood from the liver to the inferior vena cava
Why is bone marrow an essential part of the immune system?
What will be an ideal response?
During alkalosis, the renal tubules
a. secrete less hydrogen into the filtrate. b. filter out more bicarbonate ions from blood into the filtrate. c. reabsorb very little bicarbonate ions from the filtrate. d. all of these. e. none of these.