What structure has self-exciting tissue?
A self-exciting mass of specialized cardiac muscle called the sinoatrial node (S-A node or pacemaker), located on the posterior right atrium, generates the impulses for the heartbeat.
Which muscles do the Chordae Tendineae attached to quizlet?
Terms in this set (24)
- papillary muscles.
- located in both right and left ventricles, chordae tendineae attach to them to reinforce atrioventricular valves and prevent prolapse.
- chordae tendineae.
- attach the right and left atrioventricular valves to the papillary muscles for reinforcement and to prevent prolapse.
Are strong elastic vessels that carry blood to the heart?
1)Arteries are strong,elastic vessels that carry blood to the heart.
Which of the following helps return blood to the heart contracting skeletal muscles?
In many body regions, the pressure within the veins can be increased by the contraction of the surrounding skeletal muscle. This mechanism, known as the skeletal muscle pump ((Figure)), helps the lower-pressure veins counteract the force of gravity, increasing pressure to move blood back to the heart.
Which of the following is the correct sequence of parts through which blood moves from the vena cava to the lungs quizlet?
What is the correct sequence of parts through which blood moves in passing from the vena cava to the lungs? right atrium, tricuspid valve, right ventricle, pulmonary valve. You just studied 18 terms!
In which of the following are the structures that function to carry cardiac impulses correctly sequenced?
The correct answer is E. SA node, AV node, bundle of His, Purkinje fibres.
What are the blood vessels that link two capillary networks called?
They are relatively uncommon as the majority of capillary beds drain into veins which then drain into the heart, not into another capillary bed. Portal venous systems are considered venous because the blood vessels that join the two capillary beds are either veins or venules.
Is the potential space between the parietal and visceral pericardial membranes?
The peritoneal cavity is the potential space between the parietal and visceral pericardial membranes.
What might happen if the papillary muscles and or chordae tendineae stopped functioning?
What might happen if the papillary muscles and/or chordae tendineae stopped functioning? Blood would leak back into the atria from the ventricles.
Which vessel is guarded by a Semilunar valve at its base which vessel is guarded by a Semilunar valve at its base?
The semilunar valves are pocketlike structures attached at the point at which the pulmonary artery and the aorta leave the ventricles. The pulmonary valve guards the orifice between the right ventricle and the pulmonary artery.
What does chordae tendineae attach to?
The chordae tendineae connect the atrioventricular valves (tricuspid and mitral), to the papillary muscles within the ventricles. Multiple chordae tendineae attach to each leaflet or cusp of the valves.
What is the function of papillary muscles and chordae tendineae quizlet?
the chordae tendineae prevents the cusps of the tricuspid and bicuspid valves from everting into the atria when the ventricles contract. the papillary muscles pull on the chordae tendineae and help to open the cusps when the ventricles are relaxing and filling with blood.