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Cardio-Blood Vessels
| Question | Answer |
|---|---|
| Smallest of the vessels that lead into capillary beds | Arterioles |
| Which of the layers of an artery wall is regulated by the sympathetic nervous system and many hormones? | Middle layer |
| Blood flows directly from ____ into capillary beds. | Arterioles |
| The vessel layer that has a direct role in vasoconstriction is the | Tunica media |
| Thick-walled large vessels near the heart that conduct blood continuously away from the heart | Elastic arteries |
| A metarteriole is a vessel that ____. | Is intermediate between the arteriole and the capillary bed |
| Which blood vessel is most susceptible to atherosclerosis ? | |
| The aorta | |
| The endothelium is composed of ____ tissue | Simple squamous epithelium |
| Smallest of the vessels that lead into capillary beds. | Arterioles |
| _____ inhibits fibrinolysis by competing with plasminogen and may contribute to the formation of atherosclerotic plaques. | Lipoprotein (a) |
| Compare arteries and veins | Arteries carry blood away from the heart ; veins carry blood to the heart |
| The vessel layer that has a direct role in vasoconstriction is the _____. | Tunica media |
| Which of the layers of an artery wall is regulated by the sympathetic nervous system and many hormones? | Middle layer |
| A vessel that is intermediate between the arteriole and the capillary bed | Metarteriole |
| Reduction in the lumen diameter of a blood vessel as the smooth muscle contracts is known as ___. | Vasoconstriction |
| Contains the endothelium (made of simple squamous epithelium ) | Tunica intima |
| Smaller vessels that distribute blood to specific body organs. | Muscular arteries |
| Which vessels have a tunica media with relatively more smooth muscle than elastic tissue, and an elastic membrane on each face of the tunica media ? | Muscular arteries |
| Sequence of layers in the vessel walls from outside to inside. | Tunica externa, tunica media, tunica intima |
| The vessels that exhibit the lowest level of permeability | Continuous capillaries |
| Contain valves to assist blood flow back toward heart | Veins |
| Fluids would be likely to leave or filter out of the capillary if ____. | Net hydrostatic pressure (HP) is greater than bet osmotic pressure (OP) |
| Up to 65% of the body’s blood supply is found in ____. | Veins |
| Three types of capillaries | Continuous, fenestrated, sinusoid |
| The minute-to-minute blood flow through the capillary beds is determined by ____. | The diameter of the arterioles |
| Exchange of gases and nutrients occurs by diffusion between the _____. | Capillaries and tissue cells |
| Smallest blood vessels with thin walls that allow exchange between blood and tissue cells | Capillaries |
| The presence of ____ stabilizes the wall of capillaries | Pericytes |
| The only vessels that provide direct access to nearly every cell in the body | Capillaries |
| Regulated blood flow through most capillary beds | Terminal arterioles |
| Smallest vessels leading away from capillaries | Venules |
| What is the major force generating blood flow? | Pumping action of the heart |
| 3 important sources of resistance of blow flow | Blood viscosity, vessel length, and vessel diameter |
| Any condition in which blood vessels are inadequately filled and blood cannot circulate normally is called ____. | Circulatory shock |
| Pressure-sensitive mechanoreceptors that respond to changes in arterial pressure and stretch | Baroreceptors |
| Receptors that respond to changes in blood levels of carbon dioxide, H+, and oxygen | Chemoreceptors |
| Cardiovascular center activity is modified by inputs from___,___,___. | Baroreceptors, chemoreceptors, and higher brain centers |
| Lowest level of aortic pressure | Diastolic pressure |
| Hormonal control of blood flow | Angiotensin II |
| Peak of aortic blood flow |
Created by:
ReneaChristina