Circulatory System Flashcards
What is the one animal with no circulatory system?
Jellyfish
2 types of animal circulatory system?
Open = mainly insects
Closed = other animals
What can a closed system control?
The speed of blood flow
The pressure of blood
Distrubution of blood in the body
What are the 4 parts of the circulatory system
Cappilary, Heart, Vein, & Artery
Function of veins
Transport blood to heart from lungs & other body parts
Function of Arteries
Transport blood away from the heart to the lungs and other body parts
Characteristics of Arteries
Elastic Thick Walls
Areas with high blood pressure a pulse can be felt
Characteristics of Veins
Thin walls with valves
Wide diameter compared to other vessels
Low pressure
Function of valves
Open to let blood flow in and close to not let it flow backwards.
Characteristics of Cappilaries
Very small & thin
Blood flows very slowly
Exchange of oxygenated of deoxyganted blood
Joins the arteries to veins
Types of closed systems
Single & Double
Single Circulatory system means
Blood flows through the heart only once fish have this kind of system
What happens in single system for fish?
blood absorbs oxygen in the gills
then goes to body cells to release it
Then the blood returns to the heart
Double Circulatory System means
Blood goes around the body 2 times
Blood is pumped to the lungs then returned to the heart
then out to the rest of the body
Found in mammals & birds
What happens in double circulatory system?
RBCs pick up O2 blood flows through the lungs
Blood carries oxygenated blood
Drops off oxygenated blood and picks up deoxygenated blood
What is the heart made of?
All muscle
How many times does it beap per minute?
70 times on average
4 chambers of the heart
Right atrium
Left atrium
Right ventricle
Left ventricle
atria are
thin walled chambers recieve blood from veins
ventricles are
thick walled chambers that pump blood out of the heart
Difference in wall thickeness bec
Due to varations in the amount of myocardium present.
= amount of force chambers need to generate
Pulmonary =
Related to lungs
Pulmonary arteries function =
transports deoxygenated blood away from heart towards lungs
Pulmonary veins function =
transports deoxygenated blood away from the lungs towards the heart
Vene cava function =
transports deoxygenated blood towards the heart
Aorta function =
transports oxygenated blood towards the rest of the body
How does blood flow around the heart?
Superior Vene Cava –> Right Atrium –> Right Ventricle –> Pulmonary Atrery –> Lungs –> Pulmonary Vein –> Left Atrium –> Left Ventricle –> Valve –> Aorta
