Cardiorespiratory system Flashcards
(19 cards)
what are the two main functions of the heart?
1)pump de-oxygenated blood from the heart to the lungs to be oxygenated
2)pump oxygenated blood to the various tissues
what does the Atrium do?
takes blood in
what does the ventricle do?
pumps blood out
what does the vena cava do?
delivers de-oxygenated blood from the muscle + tissues to the right atrium
what does the pulmonary artery do?
carries de-oxygenated blood away from the right ventricle to the lungs
what does the pulmonary vein do?
carries oxygenated blood to the left atrium from the lungs
what does the aorta do?
carries de-oxygenated blood away from the right ventricle to go to muscles and tissues
what does lord stand for?
L-left
O-oxygenated
R-right
D-deoxygenated
what is the job of arteries?
carry blood away from heart
what are the properties of arteris?
-Mainly carried oxygenated blood
-thick smooth muscular walls
-no valves
muscles contract to push blood along
-carry blood under high pressure
-divide into smaller vessels called arterioles
what is the purpose of veins?
carry blood to the heart
what are the properties of veins?
-mainly carry de-oxygenated blood
-include valves
-uses contractions of skeletal muscles to move blood
-carries blood under low presure
what is venous return?
the process by which de-oxygenated blood is transported from the muscles into the viens and then back to the heart.
properties of capillaries:
-smallest blood vessels
-thin, one call thick,porous walls to allow gas exchange
-found in capillary beds
what is the structure (order) of the lungs?
-nose+mouth
-pharynx
-larynx
-trachea
-bronchi
-bronchiola
-alveoli
what are the functions of the lungs?
gasous exchange-oxygen in+carbon dioxide out
is respiration conscious or unconscious action?
unconscious
muscle contraction during internal respiration (breathing in)
1)diaphragm contracts, pulls down and flatterns
2)external intercostal muscles contract to elevate ribs
3)chest cavity volume increases
4)air pressure reduces
5)air draws into lungs
6)chest expands
muscle contraction during external respiration (breathing out)
1)diaphragm relaxes
2)external intercostal muscles relax
3)chest cavity volume decreases
4)air pressure increases
5)air is forced out of lungs
6)chest becomes smaller
