Circulatory system Flashcards
What are the functions of the Circulatory system?
1) helps defend the body against infection
2) collect waste substances and carry it to the excretory organs
3) Transport blood throughout the body
The central component of the circulatory system is the
Heart
Why is oxygenated blood pumped at high pressure?
To drive the blood out from the heart and the way down to the legs and arms
What blood vessel carry blood back to the heart
Veins
The parts that act like doors and control blood flow are called valves. True or False
True
The heartbeat occurs because the blood is traveling in opposite directions. True or False
False
Both oxygenated and deoxygenated blood flow to the heart. True or False
True
Heart muscles do not get tired. True or False
True
The septum allows free blood flow across the sides of the heart
False
The heart can live outside the body
False
Give two features of Arteries
(Any two work)
1)Transport blood away from the heart to body tissues and organs
2)Blood flows through under high pressure
3)Blood moves in pulses created as the ventricles contract
4)Blood flows rapidly
5)Blood is oxygenated except in the pulmonary artery
6)Most lie deep within the body so they are protected
7)Do not possess valves, except the aorta and the pulmonary artery as they leave the ventricles of the heart
Give two features of Capillaries
(Any two work)
1)Transport blood throughout all body tissues and organs, linking arteries to veins
2)Blood flows through under low pressure
3)Blood flows smoothly
4)Blood flows very slowly
5)Blood becomes deoxygenated as it travels through capillaries
6)Run throughout all tissues and organs
7)Do not possess valves
Give two features of Veins
(Any two work)
1)Transport blood back towards the heart from body tissues and organs
2)Blood flows through under low pressure
3)Blood flows smoothly
4)Blood flows slowly
5)Blood is deoxygenated, except in the pulmonary vein
6)Many lie close to the body surface
7)Possess valves to prevent the low-pressure, slow-flowing blood from flowing backward
The inner diameter of arteries is small because the walls are very thick. True or False
True
Diffusion through capillary walls is easy because capillaries are one cell thick. True or False
True
After diffusion occurs, the capillary walls die and are dissolved into the bloodstream. True or False
False
Venules join and connect to veins. True or False
True
All arteries carry blood to the heart. True or False
False
Say which blood vessels contain valves. Explain what these valves do and why they are needed
The veins contain valves and these valves are needed to ensure the blood flows in one direction
Name 4 components of blood
RBC, WBC, Platelets, plasma
Name the type of cell found in the blood that has the shape of a biconcave disc and contains a protein called haemoglobin/hemoglobin
RBC
State one function of RBC
Transport oxygen
Name the component of blood that is essential for the clotting of blood
Platelets
What are the 2 types of WBC?
Lymphocytes and Phagocytes
