Sam Belom
BIO 202
Blood Vessels & Blood Circulation HW

1. Site where blood vessels have the greatest peripheral blood resistance? Arterioles

2. Site with the lowest blood pressure?
Large Veins

3. Site where velocity of blood is the slowest?
Capillaries

4. Site where blood volume is the greatest?
Large Veins

5. Briefly describe 4 different shock conditions related to cardio-vasculature pathology. 1. Circulatory Shock- occurs when the blood vessels are inadequately filled and the blood cannot circulate normally. The tissues suffer due to the lack of blood flow. As a result, cells may die and organs may fail 2. Hypovolemic Shock- occurs to due heavy blood loss (hemorrhages, burns, severe vomiting & diarrhea).
-During this type of shock, the heart rate increases trying to help and the blood vessels decrease in diameter but blood pressure ends up dropping if the blood loss is not stopped or blood volume is not restored. 3. Vascular Shock- blood volume is normal but circulation is poor due to extreme vasodilation; blood pressure plummets as does resistance.
-Common causes are anaphylactic shock, septic shock(bacterial infection that causes vasodilation) and neurogenic shock (failure of ANS). 4. Cardiogenic Shock- pump failure; occurs when the heart cannot circulate blood properly; usually caused by myocardial damage; MI’s (heart attacks) are likely to follow to due to heart damage

6. System for fast(short term) blood pressure regulation and system for long (term) blood pressure regulation?
Short Term Blood Pressure Regulation: Hormones use peripheral resistances * Epinephrine/Noepinephrineincrease cardiac output & vasoconstriction * Atrial Natriuretic Peptide(ANP) pushes kidneys to absorb more sodium which lowers blood volume * Antidiuretic Hormone (ADH) stimulates kidneys to absorb