circulatory system Flashcards
What is the circulatory system?
The system of vessels that transports blood, and the cells and substances suspended in the blood, throughout the body
The circulatory system assists the body in maintaining homeostasis by carrying out three main functions:
1) transportation - it transports gases, nutrients, and waste materials from the excretory system
2) regulation - it regulates internal temperature and transports hormones
3) protection - it protects against blood loss from injury and against pathogens
HEART?
The pumping mechanism - pushes blood through the body and generates blood flow
BLOOD VESSELS
transport vessels - roadways through which blood moves
BLOOD?
The transport medium - blood carries nutrients, oxygen, carbon dioxide, water, wastes, and other materials throughout the body
The heart keeps oxygen WHAT blood separate from oxygen WHAT blood
Oxygen RICH blood separate from oxygen POOR blood
The heart keeps blood flowing away from what?
Away from the heart in arteries and toward the heart in veins
Left Atrium and Left ventricle
Receive oxygen rich blood from the lungs and pumps it to the body
Right ventricle and right atrium
Receive oxygen poor blood from the body and pumps it to the lungs
Septum
Prevents mixing of oxygen rich and oxygen poor blood
Pulmonary Vein
blood vessels that carry oxygen rich blood from the lungs to the LA
Pulmonary Artery
blood vessel that Carrie’s oxygen poor blood from the right ventricle to the lungs
Aorta
Major artery that Carrie’s oxygen-rich blood away from the LV to all regions of the body except the lungs
Superior Vena Cava
Collects oxygen-poor blood from the upper body and returns it to the RA
Inferior Vena Cava
Collects oxygen poor blood from the upper body and returns it to the RA
Inferior Vena Cava
Collects oxygen poor blood from the lower body and returns to the RA
Bicuspid Valve
Has two flaps and ensures blood flows from LA to LV
Tricuspid Valve
It has three flaps and ensures blood flows from RA to RV
Left Semi-Lunar valve
directs blood from LV to aorta
Right semilunar valve
Directs blood from RV to pulmonary artery
Typical resting heartbeat?
70 bpm
SA NODE?
Generates an electrical signal that spreads over the two atria and causes the cardiac muscle to contract, producing a regular heartbeat
AV Node
Receives stimulus from the SA node and causes the walls of the ventricles to contract
NORMAL BLOOD PRESSURE?
120/80
