Question

Concerning penile erection, which of the following statements is incorrect?

	a) The parasympathetic nervous system releases nitric oxide
	b) Nitric oxide activates a G-protein coupled receptor which generates cGMP
	c) Cytosolic level of cGMP increases
	d) The cytosolic calcium concentration decreases and this leads to vasodilation
	e) The sinuses in the corpora cavernosa become engorged with blood

Which of the following statements about gastric acid secretion is true?

	a) In an unstimulated parietal cell the amount of H+-K+-ATPase present is low
	b) H+ is secreted across the basolateral membrane of the parietal cell by the H+-K+-ATPase
	c) HCO3- leaves the parietal cell at the basolateral membrane, and its downhill efflux powers the uphill entry of Cl- into the parietal cell
	d) Cl- is secreted into the secretory canaliculus via a Cl- active transport protein
	e) H2 receptor blockers inhibit HCl secretion by directly inhibiting the H+-K+-ATPase

This neurohormone is produced by the enteroendocrine cells of the gastrointestinal tract especially the stomach and it increases food intake and somatotropin secretion

	a) Motilin
	b) Neuropeptide Y
	c) Orexins
	d) Ghrelin
	e) GIP

Answer 1

1 e incorrect

During erection, the corpora cavernosa wilbecome engorged with arterial blood,   the presence of mechanical stimulation, erection is initiated by the parasympathetic division of the autonomic nervous system with minimal input from the central nervous system. Parasympathetic branches extend from the sacral plexus into the arteries supplying the erectile tissue; upon stimulation, these nerve branches release acetylcholine, which in turn causes release of nitric oxide from endothelial cells in the trabecular arteries. Nitric oxide diffuses to the smooth muscle of the arteries (called trabecular smooth muscle, acting as a vasodilating agent.The arteries dilate, filling the corpus spongiosum and corpora cavernosa with blood. The ischiocavernosus and bulbospongiosus muscles also compress the veins of the corpora cavernosa, limiting the venous drainage of bloodmuscles compress the veins of the corpora cavernosa restricting the egress and circulation of this blood

3 d gherlin

Ghrelin is a circulating hormone produced by enteroendocrine cells of the gastrointestinal tract, especially the stomach, and is often called a "hunger hormone" because it increases food intake