BLOOD VESSEL AND CIRCULATION Flashcards
The ____ of the body form a network more complex than an interstate highway system.
BLOOD VESSEL
It carry blood to within two or three cell diameter of nearly all the trillions of cells that make up in the body.
BLOOD VESSEL
Blood vessels remain functional, in most cases, in excess of ____ years.
75 years
(WHEN BLOOD VESSELS ARE DAMAGED, THEY REPAIR THEMSELVES)
2 classes of blood vessel outside the heart:
PULMONARY VESSELS
SYSTEMIC VESSELS
It transport blood from the right ventricle of the heart through the lungs and back to the left atrium.
PULMONARY VESSELS
It transport blood from the left ventricle of the heart through all parts of the body back to the right atrium.
SYSTEMIC VESSELS.
Blood vessels carry blood from the heart to all the tissues of the body and back to the heart.
CARRIES BLOOD
Nutrients and O2 diffuse from blood vessels to cells in essentially all areas of the body. Waste products and CO2 diffuse from the cells, where they are produced, to blood vessels.
EXCHANGES NUTRIENTS, WASTE PRODUCTS, AND GASES WITH TISSUES.
Blood transport hormones, components of the immune system, molecules required for coagulation, enzymes, nutrients, gases, waste products and other substances to and from all areas of the body.
TRANSPORTS SUBSTANCES
The circulatory system and the heart work together to regulate blood pressure within a normal range.
HELPS REGULATE BLOOD PRESSURE
The circulatory system directs blood to tissues when increased blood flow is required to maintain homeostasis.
DIRECTS BLOOD FLOW TO THE TISSUES
Three main types of blood vessels are:
ARTERIES
CAPILLARIES
VEINS
It carry blood away from the heart, usually the blood is oxygenated.
ARTERIES
(BLOOD IS PUMPED FROM THE VENTRICLES OF THE HEART INTO LARGE, ELASTIC ARTERIES, WHICH BRANCH REPEATEDLY TO FORM PROGRESSIVELY SMALLER ARTERIES.)
Blood flow from arterioles into _____?
CAPILLARIES
_____has thinner walls than do arteries.
CAPILLARIES
(BLOOD FLOWS THROUGH CAPILLARIES MORE SLOWLY, AND THERE ARE FAR MORE OF THEM THAN OF ANY OTHER BLOOD VESSEL TYPE?
From the capillaries, blood flows into the?
VEINS
It carry blood towards the heart: usually the blood is deoxygenated.
VEINS
Blood vessel walls consist of three layers or TUNICS:
TUNICA INTIMA
TUNICA MEDIA
TUNICA ADVENTITIA
innermost layer, consists of an endothelium composed of single squamous epithelial cells, a basement membrane, and a small amount of connective tissue.
TUNICA INTIMA
middle layer, consists of smooth muscle cells arranged circularly around the blood vessel.
TUNICA MEDIA
It is composed of dense connective tissue adjacent to the tunica media; the tissue becomes loose connective tissue toward the outer portion of the blood vessel wall.
TUNICA ADVENTITIA
Are the largest diameter arteries and have the thickest walls.
ELASTIC ARTERIES
The aorta and pulmonary trunk are examples of ____?
ELASTIC ARTERIES
include medium-sized and small arteries.
MUSCULAR ARTERIES
Medium-sized arteries are frequently called _____ because the smooth muscle tissue enables these vessels to control blood flow to different body regions.?
DISTRIBUTING ARTERIES
Contraction of the smooth muscle in blood vessel, called _____ decreases blood vessel diameter and blood flow.
VASOCONSTRICTION
Relaxation of the smooth muscle in blood vessels, called ____ increases blood vessel diameter and blood flow.
VASODILATION
Transport blood from small arteries to capillaries.
ARTERIOLES
are the smallest arteries in which the three tunics can be identified.
ARTERIOLES
Blood flow though capillary network is regulated by smooth muscle cells called?
PRECAPILLARY SPHINCTERS
Capillary walls consists ____, which is a layer of simple squamous epithelium surrounded by delicate loose connective tissue.
ENDOTHELIUM
have a diameter slightly larger than that of capillaries and are compose of endothelium resting on a delicate connective tissue layer.
VENULES
is the system of blood vessels that carries blood from the right ventricle of the heart to the lungs and back to the left atrium of the heart.
PULMONARY CIRCULATION
Blood from the right ventricle is pumped into a short vessel called?
PULMONARY TRUNK
Is the system of blood vessels that carries blood from the left ventricle of the heart to the tissues of the body back to the right atrium.
SYSTEMIC CIRCULATION
All arteries of the systemic circulation branch directly or indirectly from the ____
AORTA
The aorta is considered in three parts:
ASCENDING AORTA
AORTIC ARCH
DESCENDING AORTA
Descending aorta is divided into two:
THORACIC AORTA
ABDOMINAL AORTA
is the part of the aorta that passes superiorly from the left ventricle.
ASCENDING AORTA