Flashcards in The Cardiovascular System Deck (56)
What is the cardiovascular system made up of?
Heart, blood and blood vessels.
True or False - Sympathetic nerves release chemicals that increase the heart rate and force of contractions?
Is the vagus nerve part of the sympathetic or para sympathetic system?
What is the function of the vagus nerve in relation to the heart.
When activated by the parasympathetic system it releases checmicals to slow the heart rate and reduces cardiac output.
What is blood composed of?
Plasma with different types of cells and corpuscles floating in it.
What is the ideal PH balance of blood?
What do arteries do?
Transport oxygenated blood from the heart to the capillary beds.
What do veins do?
Transport deoxygenated blood from the capillary beds to the heart.
True or False - some veins have valves to stop blood from backflowing?
What part of the body is responsible for changing the size of blood vessels?
The medulla oblingata through nerves of the autonomic nervous system.
What is oxyhaemoglobin?
Oxygen bound to haemoglobin in the blood.
What is osmotic pressure?
The pressure developed across a semipermeable membrane which forces water to pass from a more dilute solution to a more concentrated solution in an attempt to establish equilibrium.
What is the location of the heart in the body?
Midiastinum between the lungs and above the diaphragm in the thoracic cavity.
What are the three layers of the heart called?
Describe the epicardium.
Outermost wall of the heart and the pericardium covers this layer.
Describe the myocardium.
The middle layer of the heart and is the muscle layer which contracts and expels blood into the heart chambers.
This layer conducts electricity and blood is supplied by the coronary arteries.
Describe the endocardium.
Is the inner most layer of the heart and is cells that adhere to the myocardium.
What do the superior and inferior vena cava bring to the heart.
Which part of the heart does deoxygenated blood go into.
The right atrium.
What is located between the right atrium and the right ventricle of the heart.
Explain the location of the pulmonary artery.
Between the right ventricle/pulmonary valve of the heart and the lungs.
Where does oxygenated blood go when it comes from the lungs.
Through the pulmonary veins into the left atrium of the heart.
What valve is located between the left atrium and the left ventricle?
What takes oxygenated blood away from the heart?
Which is bigger the left or right ventricle?
Why is the left ventricle bigger than the right ventricle?
Requires more force to send blood to the body.
Its force is 4-6 times more than the right ventricle.
Has thicker muscle walls
What are coronary arteries?
Arteries that supply oxygenated blood to the heart.
What do arteries do?
Take blood away from the heart.
Do arteries carry blood at high or low pressure?