4 bio One of the common antihypertensive agents is a class of medicines called calcium-channel blockers. How do you think they help lower BP?O they reduce heart ratethey block entry of calcium into heart muscle cells and vascular smooth muscle cells whichgenerally contract when [Ca2+] risesO all of the answers are correctO they prevent vasoconstriction

Answer :- Option (C) is correct. - They reduce heart rate. - They block entry of calcium into heart…

One of the common antihypertensive agents is a class of medicines called calcium- channel blockers. How do you think they help lower BP? O they reduce heart rate O they block entry of calcium into heart muscle cells and vascular smooth muscle cells which generally contract when [Ca2+] rises O all of the answers are correct O they prevent vasoconstriction

One of the common antihypertensive agents is a class of medicines called calcium- channel blockers. How do you think they help lower BP? O they reduce heart rate O they block entry of calcium into heart muscle cells and vascular smooth muscle cells which generally contract when [Ca2+] rises O all of the answers are correct O they prevent vasoconstriction

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter44: Internal Transport

Section: Chapter Questions

Problem 6TYU

See similar textbooks

Similar questions

Which of these is an example of autoregulation? O The increased force response of the heart following low blood pressure O increased ventricle contraction with more filling O All of these answers are correct O the ability of the heart to contract even when there is no neural stimulation The restoration of the active state of muscle as calcium is returned to the saroplasmic reticulum
Which ONE of the following statements is TRUE? OA Cardiac myocyte contraction results primarily from an increased concentration of intracellular Na OB Prazosin is an agonist at a2 adrenergic receptors OC Veins can accommodate large volumes of blood but this causes a large increase in pressure OD The pulse pressure is the addition of systolic and diastolic pressure OE The primary integrating centre for baroreceptor reflexes is the medullary cardiovascular centre
Neurotransmitters and their respective receptors influence the propagation of action potentials. Why does ACh release at skeletal muscles cause excitation and muscle contractions whereas ACh release at the heart causes inhibition and a slowing down of the heart rate and force of heart contractions? O the ACh released at skeletal muscles and the heart are not similar skeletal muscles have more ACh receptors the properties of the ACh receptors are different a and b « Previous Next
For the average healthy human, why is the pulse rate lower immediately upon standing compared the the pulse rate in the reclining position? (Mark all that apply) When reclining, there is a gravitational force working on our body the allows the heart to exert less pressure to pump blood to the head without working against gravity O When we stand up, immediately the pulse rate goes down due to the hearts current state of exerting less force while in the reclining position. O The heart has to work harder against gravity to pump blood to all regions of the body when in the reclining position
Jake suffers from a mutation in voltage-gated calcium channels found in theirSA node. This mutation lowers the threshold at which the channels open.What effect do you think this mutation will have on his heart rate compared tosomeone with a normal threshold? Why does this effect occur?
When we flung our arms around on the first day of class our heart rate increased to meet the demands of our exercising muscles. What was the mechanism by which this occurred? O Norepinephrine bound to receptors on the SA and AV nodes of the heart O The excess CO2 in the plasma generated by our skeletal muscles directly stimulated our cardiomyocytes to contract more frequently O Parasympathetic postganglionic neurons released acetylcholine onto the SA and AV nodes of the heart
1. Calcium channel blockers, a type of anti-hypertensive drug, block the entry of calcium into smooth muscle which causes smooth muscle to relax. Explain how this decreases blood pressure. Explein why outting on orteri:el voeeel will oOuee a arester lese of bleod over th ome o meunt of time
Nodal (conductile) cells in the heart differ from other myocardiocytes (contractile cells) in that nodal cells have_____. A channels that allow Na+ to slowly leak in between action potentials B gap junctions while other myocardiocytes do not C more rapid depolarization in their action potentials due to voltage-gated Na+ channels D action potentials without plateau phases because they lack Ca+2 channels
In which of the following situations is calcium moving through a channel in the pacemaker membrane driven by concentration but against charge? O during the repolarization phase of the action potential, just before the channel closes O during the depolarization phase of the action potential, just after the channel opens O never O at all times that sodium is moving through the membrane O during the repolarization phase of the action potential, just after the channel opens O during the depolarization phase of the action potential, just before the channel closes O during the pacemaker potential, just before the funny channel closes
Epinephrine causes vasodilation of blood vessels in cardiac musclebut vasoconstriction of blood vessels in the skin. Explain why this isa beneficial arrangement.
The heart cannot increase its contraction strength via recruitment because: Gap junctions allow free movement of ions between cells Cardiac action potentials are prolonged The cardiac muscle cell is in its refractory period O Plenty of calcium ions are released to allow full crossbridging during each contraction Heart muscle is always at optimum length
Which statement about activation of heart muscle cells is TRUE? A when a person is resting only a few small motor units in each ventricle are activated in each heartbeat B all of the muscle cells in the ventricles depolarize and contract together because they are connected by gap junctions C motor neurons must synapse with all of the muscle cells in the ventricles at the same time or fibrillation will occur D all of the heart muscle cells have unstable resting membrane potenitals and slowly depolarize to threshold at the same rate