Blood Vessels

Question 1

Pre capillary sphincters

Answer 1

Guards entrance into capillaries. If contract less BF. If relax more BF. Found in capillaries. Open when CO2 rises. Close whenCO2 decline

Question 2

What are collaterals?

Answer 2

More than one artery fusing to make capillary bed

Question 3

Arteriovenous anastomoses

Answer 3

Direct connection between arterioles and Venules

Question 4

Metaarterioles

Answer 4

Passageway between arterioles and capillaries

Question 5

Thoroughfare channel

Answer 5

Passageway of typical capillary

Question 6

What best describes autoregulation?

Answer 6

Pre capillary sphincters go through alternate contractions

Question 7

What acts as a blood reservoir?

Answer 7

Venous system. Reducing blood in venous system can maintain blood volume within blood volume at normal levels despite blood loss

Question 8

During significant blood loss, how does the venous system keep arterial supply going?

Answer 8

Medium sized veins contract and venoconstriction occurs reducing blood volume in the venous system. Blood enters general circulation from venous networks in liver, bone marrow, skin