structures and functions of the rat circulatory system
keeps the heart contained in the chest cavity, prevents the heart from over expanding when blood volume increases and limits heart motion
driving force behind the entire circulatory system
carries blood from the dorsal blood vessel to the ventral blood vessel
carries and distributes oxygen rich blood to all arteries
common carotid arteries
supply oxygenated and nutrient-filled blood to the head and neck regions of the body
right and left auricle
R: receives blood returning to the heart from the superior and inferior venae cavae L: receives blood returning to the heart from the pulmonary veins
right and left ventricle
R: receives blood from the right atrium and pumps it to the main pulmonary artery L: Receives blood from the left atrium and pumps it to the aorta
right and left cranial vena cava
superior: brings de-oxygenated blood from the head, neck, arm, and chest regions of the body to the right atrium inferior: brings de-oxygenated blood from the lower body regions (legs, back, abdomen, and pelvis) to the right atrium
channels blood form the right ventricle through the right and left pulmonary arteries to the lungs
hepatic portal vein
vessel in the abdominal cavity that drains blood from the gastrointestinal tract and spleen to capillary beds in the liver
transports blood out of the kidney
iliolumbar artery and vein
leads from the lower back; drains blood from the abdominal cavity and lower extremities of the body
How is a portal system different from a normal cirulatory sytem circuit?
In a portal system, capillar beds pool into another capillary bed through veins without going to the heart first, whereas the circulatory system circuit goes to the heart first.
What is the purpose of veins?
Veins drain blood from the tissues and return it to the heart
What is the purpose of arteries?
Arteries supply blood to the tissues
How are pulmonary veins and arteries any different than systemic arteries?
Pulmonary veins and arteries travel between the heart and lungs while systemic arteries travel from the heart to the rest of the body
In terrestrial vertebrates, what is the advantage of having the surfaces for oxygen and carbon dioxide exchange embedded deep in lung tissue (think moisture)?
Moisture helps to increase the exchange between oxygen and carbon dioxide, while also protecting the exchange
prevents collapse as organism inhales; leads from the nasopharynx through the larynx and into the lungs
left and right bronchus
carry air into and out of the lungs
left and right lung
store the body's oxygen supply and works to push air out and around the body
allows the thoracic cavity to expand and compress, drawing in fresh air with each expansion and expelling stale air with each compression
What is the purpose of the epiglottis?
The epiglottis permits air flow through to the larynx
What occurs in alveoli?
Oxygen is picked up by the bloodstream and carbon dioxide is release into the lungs to be expelled from the body through exhalation
How does the diaphragm function to pull air into and out of the lungs?
As the diaphragm contracts, fresh air is drawn in, and as the diaphragm relaxes, stale air is expelled