Chapter 16-17 Flashcards
What is the name given to the neurons that monitor carbon dioxide levels in the blood and are located in the carotid and aortic arteries
Chemoreceptors
A ______ blood vessel with a ____ diameter would have the greatest resistance to blood flow
Long
Small
Pulmonary circulation goes from the ____ _______ to the ____ _____
Right ventricle
Left atrium
Which blood vessels contain blood with the highest oxygen content
Pulmonary veins (arteries)
From which major blood vessel do all systematic vessels branch
Aorta
Which circulatory route brings blood to the tissues and back to the heart
Systemic circulatory
Which circulatory path carries blood rich in substances absorbed from the gastrointestinal tract
Hepatic portal circulation
___ ___ the heart have the lowest blood pressure
Veins closest
Vascular resistance is primarily due to which factor
Friction between the blood walls
When the left ventricle contracts, what term is given to the pressure in arteries that is generated
Systolic
In fetal circulation, which structure connects the fetal pulmonary trunk to the aorta, allowing much blood to bypass the lungs
Ductus arteriosus
Stimulation of the ____ would cause the heart rate to decrease
Vagus nerve
In the fetus, what is the opening that allows blood to pass directly from the right atrium to the left atrium
Foramen ovale
With aging, cardiac muscle fibers _____ in size
Decrease
The fetal circulation differs from the adult circulation because of which organ system that is nonfunctional
Lungs (respiratory system)
As blood passes from the superior and inferior vena cavae to the lungs, it moves through the ____ ___ to the ____ ____ and out through the ______
Right atrium
Right ventricle
Pulmonary trunk
Carry blood away from the heart
Arteries
Vessels with high blood pressure
Arteries
Vessels with the fastest flow
Arteries
Vessels that exchange food and waste between blood and tissues
Capillaries
Vessels that return interstitial fluid to the bloodstream
Lymphatic vessels
Vessels with the slowest blood flow
Capillaries
Vessels with a thick muscle layer
Arteries
Vessels with very thin walls, only have a single layer of cells
Capillaries
Vessel with the smallest internal diameter
Capillaries
Vessels with a very thin muscle layer
Veins
Vessel that exhibit a pulse
Arteries
Vessels that bring blood to almost every cell in the body
Capillaries
Known as exchange vessels
Capillaries
What are the cells that migrate to the thymus and when mature are able to attach microbes directly
T-cells
What name is given to blood flow from the heart to the lungs
Pulmonary circulation
Blood pressure is measured by listening for a constricted ____ to pop open
Artery
The backward flow of fluid in veins and lymphatic a is prevented by ____
Valves
The most important function of the circulatory system is to ______ materials to and from all cells
Transport