Activation of β2-adrenergic receptors in vascular smooth muscle stimulates vasodilation / vasoconstriction. Give an example of organs where this occurs.

Describe the intracellular response to activation of α and β adrenergic receptors

One tretment for myasthenia gravis is a medication that blocks the activity of acetylcholinesterase. Why is this a successful treatment?

please answer the following question Stimulation of the sympathetic nervous system results in restriction of blood flow to some tissues due to contraction of vascular smooth muscle and increased blood flow to other tissues due to relaxation of vascular smooth muscle.  Describe a mechanism by which these opposite responses to the same neurotransmitter can occur.

What statement is NOT true about the length constant? is the distance along the dendrite from the site of current input to the site where Vm has decayed by 37% the decay of current by 37% over a specific segment along an axon the decay of membrane potential as a function of membrane and axial resistances the passive decay of current over distance

Which type and speed of slow axonal transport moves distinct polypeptides to the neuronal periphery?     SCa 0.1 to 1mm/day     SCa 1 to 3mm/day     SCb 1 to 3mm/day     SCc 0.1 to 100mm/day

What is the direct effect (prior to any reflex compensation) of administeringintravenously a selective beta 1 receptor agonist?A)Increased heart rate, stroke volume and total peripheral resistance.B)Increased total peripheral resistance and renin secretion.C)Increased heart rate and stroke volume.D) Increased total peripheral resistance and decreased renin secretion.E) Decreased renin secretion, total peripheral resistance and heart rate.

What becomes active during a sag in neuron which is an indication of hyperpolarisation activated cation current?

Which of the following physiologic responses are associated with elevated sympathetic nervous system activity? O CODE enhanced digestion enhanced absorption of nutrients N decreased heart rate increased contractile force of the heart both A and B

Caffeine lowers the heart rate by increasing rates of depolarization at the SA node   True False   Nicotine raises the heart rate because it stimulates the activity of the sympathetic neurons in medulla oblongata   True False   The Frank-Starling Law of the Heart states that the force of heart contraction is directly proportional to the initial length of the muscle fiber, within optimal limits of length   True False If the sarcomeres stretched beyond the optimal length, the force of contraction would go down, but that can potentially happen only during open heart surgery when the heart is not constrained by the pericardium, lungs, ribs and diaphragm.   True False It is the Na+ channel-driven spontaneous depolarization that is affected by sympathetic and parasympathetic inputs to speed up or slow down the firing rate of the SA node and other conductive cells.   True False