Chapter 11 Review Flashcards
Tricupsid valve
Located between the right atrium and right ventricle. Closes to prevent back flow into the right atrium during ventricular contraction.
Bicupsid valve
Located between the left atrium and left ventricle. Closed during ventricular contraction to prevent back flow into the left atrium.
Pulmonary semilunar valve
Located between the right ventricle and the pulmonary artery. Closes to prevent back flow into the right ventricle during ventricular relaxation. When the ventricles relax, blood flows backward in the pulmonary artery pushing the semilunar valve doors closed.
Aortic valve
Located between the left ventricle and the aorta. Opens when the ventricles contract to allow oxygenated blood flow to the body. Closes when ventricles relax to prevent back flow in the left ventricle.
What is the difference between the pulmonary and systemic circulations?
Pulmonary: moves blood between the heart and the lungs.
It transports deoxygenated blood to the lungs to absorb oxygen and release carbon dioxide. The oxygenated blood then flows back to the heart.
Systemic: moves blood between the heart and the rest of the body.
How do the structural differences between the ventricles relate to the function of the ventricles?
The myocardial tissue is thicker on the left ventricle as this side must contract to push blood to all regions of the body. The myocardial tissue on the right is thinner as contraction only needs to move blood to the lungs.
How are the great vessels able to bring nutrients to tissues despite being large?
Arteries connect to arterioles. Arterioles connect with even smaller blood vessels called capillaries. Through the thin walls of the capillaries, oxygen, and nutrients pass from the blood into tissues, and waste products pass from tissues into blood. From the capillaries, blood passes into venules, then into veins to return to the heart.
What are the main structural differences between veins and arteries?
Veins carry blood toward the heart
Arteries carry oxygen away from the heart
Arteries are often described as vessels that carry oxygen-rich blood, and veins are said to carry oxygen-poor (carbon-dioxide rich) blood. What are 2 sets of exceptions to this rule that were discussed in this chapter?
Pulmonary artery carries deoxygenated blood away from the heart towards the lungs. The pulmonary veins carry oxygenated blood from the lungs to the left atrium
What structure feeds the heart tissue itself with oxygen, and is a landmark to identify the anterior heart in dissection?
Coronary arteries
During the cardiac cycle, when are the AV valves open?
During mid to late diastole, heart is completed relaxed
and blood flowing passively into and through the atria into the ventricles.
During the cardiac cycle, when are the AV valves closed?
During ventricular systole, pressure within the ventricles increase rapidly, closing the av valves.
During the cardiac cycle, when are the Semilunar valves open?
Ventricular systole, when the intraventricular pressure is higher than the pressure in the large arteries leaving hte heart (pulmonary trunk or aorta) the semilunar valves are forced open.
During the cardiac cycle, when are the Semilunar valves closed?
During all of diastole while blood filled the atria and ventricles.
What is responsible for the ¨lub-dub¨ sounds? Which is louder? Which is longer?
This sound comes from the valves shutting on the blood inside the heart. The first sound (the lub) happens when the mitral and tricuspid valves close. The next sound (the dub) happens when the aortic and pulmonary valves close after the blood has been squeezed out of the heart.