1.2 Cardiovascular and respiratory systems Flashcards
Name the two circuits for moving the blood?
pulmonary circuit
systemic circuit
What is the pulmonary circuit?
circulation of deoxygenated blood through pulmoary arteries to lungs & pulmonary veins back to heart
What is the systemic circuit?
circulation of oxygenated blood through aorta -> body and deoxygenated blood back through vena cava back -> heart
What are the four heart chambers?
right atrium, left atrium, right ventricle, right ventricle
What are the four heart valves?
- tricuspid valve
- bicuspid valve
- pulmonary semilunar valve
- aortic semilunar valve
Why is it better to have a more efficient cardiovascular system
the greater the capacity to remove waste products from muscles
Describe the left side of the heart
-has thicker muscular wall which can contract with more force
-circulates oxygenated blood from lungs to muscles and organs
Describe the right side of the heart
-contracts to circulate deoxygentaed blood from body to lungs
What type of muscle is in the heart?
cardiac muscle
Explain the flow of blood through the left side of the heart
blood oxygentaed at lungs
pulmonary veins –>
left atrium –>
bicuspid valve –>
left ventricle –>
aortic semilunar valve –> aorta –>
body tissues
Explain the flow of blood through the right side of the heart
deoxygentaed blood arrives from muscles and organs to right atria
vena cave –>
right atrium –>
tricuspid valve –>
right ventricle –>
pulmonary semilunar valve-> pulmonary artery –>
lungs
What is oxygenated blood
blood with oxygen and nutrients
What is deoxygenated blood
blood depleted of oxygen, saturated with carbon dioxide and waste products
What is the conduction system
-structures in cardiac muscle
creates, transmits electrical impulse
forcing atria and ventricles to contract
Name the 5 sturctures that make up the conduction system
(SABBP)
-Sino-atrial node (SA NODE)
-Atrio-ventricular node (AV NODE)
-Bundle of His
-Bundle branches
-Purkyne fibres
The cardiac muscle is myogenic
-what is myogenic
-capacity of the heart to generate its own electrical impulse- causes cardiac muscle to contract
What is the SA node?
in wall of right atrium. sends impulse across both atria causing atrial systole (contraction)
What is the AV node
in middle wall of heart between atria and ventricles
receives impulse from the SA node, delays for a moment to allow for atrial systole to finish and sends it down the bundle of His
What is the Bundles of His
middle of wall of heart. Transmits impulses to the bottom of the right and left side of the heart
What are the Purkinje fibres
in walls of ventricles, cause impulse to penetrate into ventricle walls causing ventricular systole
What is a diastole
-relaxation phase of cardiac muscle where blood chambers fill with blood
What is a systole
contraction phase of cardiac muscle where blood is ejected into aorta and pulmonary artery
What is atrial diastole
when atrium is relaxing- atria fills with blood blood from vena cava and pulmonary vein. AV valves closed. Atrial pressure rises above ventricular pressure. Blood starts to pass passively into ventricles
What is atrial systole
when atrium is contracting
What is ventricular diastole
when ventricle is relaxing
What is ventricular systole
when ventricle is contracting