Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 40, Problem 12RQ
During the systolic phase of the cardiac cycle, the heart is.
- contracting
- relaxing
- contracting and relaxing
- filling with blood
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Students have asked these similar questions
The pressure in the veins sufficiently high to drive the flow of blood into the
heart is callec
venous return
cardiac output
stroke volume
isovolumic contraction
isovolumetric contraction
isovolumetric relaxation
ventricular filling
ventricular ejection
closed
rises
S1
drops
depolarize
S2
The first phase of the cardiac cycle is
. This is when a lot of blood is in the atria, which causes atrial pressure to be higher than the ventricles. The
atrioventricular valves open, and blood moves from the atria to the ventricles. At the end of this phase, the atria contract to maintain pressure and blood flow into the
ventricles. As blood leaves the atria, the pressure in the atria
As blood enters the ventricles, the pressure in the ventricles
Towards the end of this phase, the pressure in the ventricles will exceed the pressure in the atria. At this point, the heart enters the second phase of the cardiac cycle:
At this point, the AV valves shut, and we hear
. The atria repolarize and the ventricles
(due to the QRS complex of the ECG), causing ventricular contraction. Although contracting, it is not yet moving blood into the arteries. All 4 heart valves…
The heart is resting during
Select one:
ventricular systole.
the ejection period.
ventricular diastole.
atrial systole.
Chapter 40 Solutions
Biology 2e
Ch. 40 - Figure 40.10 Which of the following statements...Ch. 40 - Figure 40.11 Which of the following statements...Ch. 40 - Figure 40.17 Varicose veins are veins that become...Ch. 40 - Why are open circulatory systems advantageous to...Ch. 40 - Some animals use diffusion instead of a...Ch. 40 - Blood flow that is directed through the lungs and...Ch. 40 - White blood cells: can be classified as...Ch. 40 - Platelet plug formation occurs at which point?...Ch. 40 - In humans, the plasma comprises what percentage of...Ch. 40 - The red blood cells of birds differ from mammalian...
Ch. 40 - The heart's internal pacemaker beats by: an...Ch. 40 - During the systolic phase of the cardiac cycle,...Ch. 40 - Card io myocytes are similar to skeletal muscle...Ch. 40 - How do arteries differ from veins? Arteries have...Ch. 40 - High blood pressure would be a result of...Ch. 40 - Describe a closed circulatory systemCh. 40 - Describe systemic circulationCh. 40 - IS. Describe the cause of different blood type...Ch. 40 - List some of the functions of blood in the body.Ch. 40 - How does the lymphatic system work with blood...Ch. 40 - Describe the cardiac cycleCh. 40 - What happens in capillaries?Ch. 40 - How does blood pressure change during heavy...
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- Figure 40.11 Which of the following statements about the heart is false? The mitral valve separates the left ventricle from the left atrium. Blood travels through the bicuspid valve to the left atrium. Both the aortic and the pulmonary valves are semilunar valves. The mitral valve is an atrioventricular valve.arrow_forwardIn the systemic circuit, the hearts _______ half pumps blood to all body regions; then blood flows to the heart. a. left; deoxygenated; oxygenated b. right; deoxygenated; oxygenated c. left; oxygenated; deoxygenated d. right; oxygenated; deoxygenatedarrow_forwardContraction of _______ drives the flow of blood through the aorta and pulmonary arteries. a. atria b. veins c. arterioles d. Ventriclesarrow_forward
- The contraction phase of the heartbeat is ______; the relaxation phase is _______.arrow_forwardduring the four phases of the cardiac cycle. Which valves open/close during these phases? Ventricular Isovolumetric Ventricular Isovolumetric Filling Contraction Ejection Relaxation Blood Flow Low Ventricular Volume Ventricular Pressure Aortic Pressure Which valves open/close in the beginning ofarrow_forwardWhich of the following factors does not directly affect cardiac output? the volume of blood ejected with each contraction the stroke volume the rate of heart contraction resistance in the vasculaturearrow_forward
- The term epicardium (visceral pericardium) refers to O the thickest layer of the heart coverings, looking like a sac a thin surface membrane adhered on the surface of the heart simple squamous epithelium lining the inside of the heart. trabeculae carnaearrow_forwardThe fibrous skeleton of the heart functions to: O provide an anchor for the heart valves all of these choice are correct maintain the shape of the heart O provide electrical insulation between the atria and ventriclesarrow_forwardPut these phases of the cardiac cycle in the correct order. opening of the semilunar valves isovolumetric contraction atrial systole begins closure of the AV valves ventricular filling is complete ventricular systole begins ventricular relaxation ventricular ejectionarrow_forward
- Which of the following is not correct regarding the heart? ventricular fibrillation occurs from autorhythmic cells firing out of sequence the majority of cells are contractile, very few are autorythmic the atria and the ventricles contract at the same time both ventricles contract almost at the same timearrow_forwardDuring Diastole, pressure inside the ventricle drops to near zero, but pressure inside the aorta only decreases to 80 mmHg. Pressure remains elevated in the aorta because The walls are elastic Blood is flowing so fast Smooth muscles are actively contracting There is resistance to flowarrow_forwardthe skeleton of heart is composed of * prominent loose connective tissue prominent loose regular connective tissue prominent dense irregular connective tissue reticular fiber non of abovearrow_forward
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