Vessels and Circulation
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What is it called when two or more arteries merge to supply the same body region?
What is the space inside arteries called?
What are the three layers of arteries and veins?
- tunica intima: endothelium
- tunica media: smooth muscle
- tunica externa: connetive tissue
What is the thickest layer in the arteries and veins?
- arteries: tunica media
- veins: tunica externa
What layer does the capillaries contain?
tunica intima only
What are the two types of arteries?
- elastic: 2.1-1 cm. aorta, pulmonary, brachiocephalic, common carotic, subclavian, common iliac arteries
- muscular arteries: 3mm-1cm. most arteries
How big is the diameter of a capillary?
8-10 micrometers, just slightly larger than 7 micrometer erythrocytes
What are the three types of capillaries?
- continuous capillaries: most common
- Fenestrated: intestines, endocrine glands, and kidneys
- Sinusoids: larger
How much blood are in the veins?
When does a venule become a vein?
after it's diameter is greater than 100 micrometers
What helps monitor blood pressure in the skull?
carotic sinus which contains baroreceptors
What artery pulsates when you have a headache?
superficial temporal artery
What artery enters the skull through the foramen magnum?
what important anastomosis surrounds the sella turcica?
Circle of Willis (cerebral arterial circle)
What vein supplies arterial blood to the abdominal portion of the esophagus?
left gastric artery
What three arteries supply blood to the diaphragm?
- superior phrenic
- musculophrenic arteris
- inferior phrenic arteries
What is the largest autonomic nerve plexus?
celiac plexus: left gastric, splenic, and common hepatic arteries come from this
What is the blood flow of the arm?
axillary artery-brachial artery-unlar/radial artery-superficial palmar arch/deep palmar arch/ digital arteries
Where can the femoral artery be palpated?
femoral triangle, used to control bleeding and get blood samples
What do the posterior and anterior tibial arteries turn into?
lateral plantar artery and dorsalis pedis artery
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