How does an increase in heart rate contribute to an increase in blood pressure? O It increases the total peripheral resistance as it increases the amount of blood entering the blood vessels per minute. O It increases the cardiac output as this is solely determined by the heart rate. O It increases the cardiac output, as this is determined by the stroke volume and the heart rate. It reduces the cardiac output, as this is inversely proportional to the heart rate. O It increases the stroke volume as it will cause an increase the force of contraction of the heart.

How does an increase in heart rate contribute to an increase in blood pressure? O It increases the total peripheral resistance as it increases the amount of blood entering the blood vessels per minute. O It increases the cardiac output as this is solely determined by the heart rate. O It increases the cardiac output, as this is determined by the stroke volume and the heart rate. It reduces the cardiac output, as this is inversely proportional to the heart rate. O It increases the stroke volume as it will cause an increase the force of contraction of the heart.

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter9: Cardiac Physiology

Section: Chapter Questions

Problem 13RE

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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
Which of the following is not true about the resting Cardiac membrane potential? O A. The membrane resting potential is equal to the Nernst potential for potassium. O B. The membrane resting potential has a low sodium conductance. O C. Balanced current flow gives rise to the resting membrane potential. O D. Pumps and exchangers maintain the background electrical gradients. O E. The Nernst potential for sodium is positive to the resting membrane potential.
Cardiac output increases during exercise due to an increase in both heart rate and stroke volume. Which of the following contribute to this increase in stroke volume? (Select all that apply). Constriction of veins by the sympathetic nervous system O The increase in heart rate directly increases filling time Increased stretching of the cardiac myocytes due to increased EDV O Increased sympathetic stimulation of the ventricles O Withdrawn (decreased) parasympathetic stimulation of the ventricles
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
Which statement about tachycardia is NOT correct? O A normal heart rate for an infant may be twice as fast as a normal heart rate for an older child. O Tachycardia may be a normal, non-dangerous heart rate in response to stress or anxiety. O A heart rate of 175 bpm is within normal range for a child up to two. O Sinus tachycardia is commonly a dangerous rhythm that can quickly deteriorate to cardiac arrest. Cardiac arrest in pediatrics is most commonly caused by O Exercise o Injury O Poor diet O Respiratory problems When should cardiac pacing be administered to an individual with symptomatic bradycardia with a pulse? O If the individual does not respond to CPR O If the individual does not respond to CPR and pharmacological support O None of the above O If the bradycardia is the result of a complete heart block or an abnormal sinus node function Which statement regarding distributive shock is NOT true? O Distributive shock can be characterized as either warm shock or cold shock O…
Which best describes blood flow through the heart? O oxygenated blood comes into the heart's left atrium, is pumped into the left ventricle, then pushed throughout the body O deoxygenated blood comes into the left ventricle, is pumped into the left atrium, then pushed to the lungs to be oxygenated O oxygenated blood comes into the heart's right atrium, is pumped into the left atrium, then pushed throughout the body O deoxygenated blood comes into the heart's right atrium, is pumped into the left atrium, then pushed throughout the body
Which of the following is not true about Ventricular cardiac action potentials? O A. Action potentials arise from current flow across membranes. B. Current is carried by neutral ions. O C. Action potentials fire in an all-or-none fashion. OD. A stimulus usually initiates the action potential in healthy cells. O E. Potassium is the dominant current during the diastolic interval. HELENT
Physiological resting heart rate is increased by: O A. Vagal inhibition. OB. Stimulation of adrenergic receptors. OC. Sympathetic stimulation. OD. None of the above. O E. All of the above.
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 of the following is TRUE of the cardiac action potential? O The cardiac action potential requires external stimulation The cardiac action potential does not have repolarization The cardiac action potential is longer than the skeletal muscle action potential The cardiac action potential has no refractory period O The cardiac action potential has a shorter refractory period than skeletal muscle
How could the cardiovascular system maintain constant mean arterial pressure following vasodilation and decreased resistance in peripheral blood vessels? increasing stroke volume or heart rate decreasing stroke volume or heart rate O increasing stroke volume or decreasing heart rate decreasing stroke volume or increasing heart rate
In conditioned athletes, the resting Heart Rate is generally much lower than in non-athletes. Why? a-because long-term exercise reduces Cardiac Output at rest to conserve energy b-because athletes have a smaller Stroke Volume at rest, causing Heart Rate to decrease as well c-because long-term exercise leads to increased vagal tone which slows Heart Rate d-because athletes have stronger ventricles and therefore a larger Stroke Volume at rest, so they require fewer bpm to achieve the same Cardiac Output