The apical ectodermal ridge
A. forms at the proximal end of each limb bud.
B. plays a role in differentiation and elongation of the limb.
C. ossifies prior to formation of the hand and foot plates.
D. must undergo apoptosis before the limb can develop.
E. secretes mesoderm for muscle formation.
B
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Aldosterone from the adrenal cortex causes sodium ions to be
A. conserved and potassium ions to be excreted. B. excreted and potassium ions to be conserved. C. conserved and potassium ions to be conserved. D. excreted and potassium ions to be excreted.
Which hormones are the main stimulating hormones in the postabsorptive state process of glycogenolysis?
a) Epinephrine b) Glucagon c) Cortisol d) Epinephrine and Glucagon e) Glucagon and Cortisol
Nerve impulses leading to the brain carry information about cool temperatures on the skin. The nerve fibers sending these signals will most likely belong to which division of the nervous system?
A) sensory (afferent) division B) somatic nervous system C) sympathetic division D) parasympathetic division
Soon after birth, what happens to the foramen ovale?
A. It closes to form the fossa ovalis. B. It only allows blood to flow between the left and right ventricles. C. It forms the ductus arteriosus. D. It forms the ligamentum arteriosum.