The blood pressure is regulated by chemoreceptors on blood vessels, baroreceptors and kidneys. The baroreceptors and chemoreceptors do locate within the walss of wreterial system to regulate blood pressure. This blood pressure is varied with minor changes in oxygen levels in blood. Kidneys do play significant role in maintaining blood volume so that, blood pressure is significantly maintained.
Blood vessels such as capillaries, arteries and arterioles contain structural components such as smooth muscle layers, endothelium internally. Tunica media, tunica externa and tunica interna are associated with lamina propria and basement membrane together to form wall of the blood vessels structure. This smooth muscle layers and endothelial cells mainly contain adrenoceptors and cholinergic receptors enable to maintain persistent blood pressure (120 (systolic pressure) /80 (diastolic pressure) mm of Hg). Adrenaline and acetylcholine acts on these receptors to maintain constant blood pressure with homeostasis via signal transduction finally produce vasoconstriction and vasodilation respectively.
Thus, the options (d), (c) and (d) are incorrect.
The blood pressure is regulated by chemoreceptors on blood vessels, baroreceptors and kidneys. The baroreceptors and chemoreceptors do locate within the walss of wreterial system to regulate blood pressure. This blood pressure is varied with minor changes in oxygen levels in blood. Kidneys do play significant role in maintaining blood volume so that, blood pressure is significantly maintained.
Therefore, the correct option is – a. Baroreceptors and chemoreceptors both work within the walls of the arteries sending out impulses to raise or lower blood pressure, whereas kidneys help control blood volume.