Which structure connects the yolk sac to the embryonic midgut?
A. Liver bud
B. Vitelline duct
C. Hepatopancreatic ampulla
D. Gastric duct
E. Foregut dilation
B. Vitelline duct
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What is moving a limb away from the midline of the body along the frontal plane called?
A) flexion B) abduction C) extension D) adduction
What component of blood is directly related to the immune system?
a. leukocytes b. erythrocytes c. platelets d. cell fragments e. thrombocytes
Blood borne factors (e.g. ions, glucose, amino acids) cause the release of all of these hormones except ________
A) insulin B) epinephrine C) calcitonin D) parathyroid hormone (PTH)
The ________ principle states that the size and speed of an action potential are independent of the stimulus strength
A) threshold B) all-or-none C) graded potential D) saltatory propagation E) summation