The Cardiac Cycle
The cardiac muscles of the heart relax and contract rhythmically.
What is the cardiac cycle?
causes all the muscle cells in your heart to beat in unison
What is sinoatrial node
In simple animals, nearly all the cells are in direct contact with the outside world.
True or False
True
The blood is mostly composed of red blood cells
True/False
False
This vessel carries blood away from the heart
What is arteries
The relaxation phase of the heart cycle
what is diastole
Sinoatrial node is made up of specialized muscle tissue in the wall of the _____ that generates electrical impulses
What is right atrium
fluid is pumped through open-ended tubes and flows out among cells
what is Open circulatory system
This consists of water and dissolved salts, proteins, and various other molecules, such as nutrients, wastes, and hormones
What is plasma
This vessel carries blood to the heart
What is vein
The contraction phase of the heart
what is systole
Production of erratic heart rhythms due to a poor functioning sinoatrial node in the heart creates a need for
Artificial Pacemaker
blood is pumped within a set of closed tubes and is distinct from the interstitial fluid
What is Closed circulatory system
an iron-containing protein that transports oxygen.
What is red blood cells
This vessel has thin walls, allow exchange between blood and interstitial fluid
What is capillaries
Ventricle contracts during this phase
What is systole phase
The closed circulatory system of humans and other vertebrates.
What is cardiovascular system
This circuit carries blood between the heart and the rest of the body
What is Systemic circuit
This system consists of several organs that facilitate exchange of O2 and CO2 between the environment and cells.
What is respiratory?
is the control of the gain or loss of water and dissolved solutes.
Osmoregulation
Heart muscles relax during this phase
What is diastole
During this circuit blood supplies O2 to body tissues while it picks up CO2.
what is systemic circuit
This circuit carries blood between the heart and lungs.
what is pulmonary circuit
This blood vessel has valves to prevent flowback of blood.
What is Vein
an abnormally high internal temperature, is a body-wide response that usually indicates an ongoing fight against infection
Fever