Blood Flow
Blood in the pulmonary veins returns to the...
Left Atrium
What blood vessel does the following statement describe:
"All carry blood away from the heart"
Arteries
True or False: The Atria receive blood returning to the heart.
True!
Oxygen and Carbon Dioxide are exchanged in the lungs and through the cell membranes of the...
Alveoli
True or False: The epiglottis covers the opening of the trachea when we swallow to prevent food from entering our airways.
True!
The contraction phase of the cardiac cycle is known as _______________.
Systole
Microscopic vessels where nutrients and gasses are exchanged...
Capillaries
The AV valve is closed when
the ventricle contracts!
True or False: the level of CO2 in the blood is what stimulates our body to increase breathing rate.
True
What are the pieces of cells that help with clotting?
Platelets
Oxygen is carried by ________________ in the red blood cells.
Hemoglobin
What is a characteristic of capillaries?
They are the vessels where gas exchange and nutrient diffusion take place.
They have a larger total diameter than the diameter of the arteries.
Blood flow is slower in capillaries.
True or False: The semilunar valves open when the atria contracts.
False!
The _________ are tubes that branch off the trachea and enter the lungs.
Bronchi
____________ are the vessels that take blood to the heat.
Veins
What valve of the heart prevents blood from flowing back into the atria when the ventricles contract?
AV Valve
Which vessel receives blood when the right ventricle contracts?
The pulmonary artery
Blood pressure is greatest in which blood vessel?
Aorta
The __________ are the air sacs in our lungs.
Alveoli
The _________ valves of the heart are found between the ventricles and the heart exits.
Semilunar
Oxygen poor blood enters the right ___________.
atrium
The _____________ is the vessel that brings oxygen poor blood from the body to the heart.
Vena Cava
What is the pacemaker of the heart?
Sinoatrial (SA) node
What can be described as " A tiny branch of air tubes in the lungs.
Bronchioles
The left atria contracts, sending the blood through the av valve into the left ventricle. The left ventricle pumps the blood through the ______________ valve into the aorta, which takes the blood to the organs and tissues of our body.
Semilunar