The first animals to show true tissues were
A) Sponges.
B) Placozoans.
C) Cnidarians.
D) Ctenophores.
Answer: C
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Epithelial cells that are adapted for membrane transport of materials, such as ions and nutrients, usually have ________ on their apical surface.
A) junctional complexes B) microvilli C) cilia or flagella D) vesicles E) mitochondria
The negative feedback control of HCl secretion in the gastric phase of gastric regulation is mainly by ________ secretion.
A. increase in somatostatin B. increase in gastrin C. decline in gastrin D. Both decrease in gastrin secretion and increase in somatostatin secretion are correct.
The large cartilaginous external portion of the ear is called the:
A) ossicle. B) cochlea. C) auricle. D) oval window.
Which portion of the kidney delivers urine to the ureter?
A) renal sinus B) renal medulla C) renal cortex D) renal pelvis