1. CONTROL OF BLOOD SUPPLY
CIRCULATORY
O2 AND CO2 TRANSPORT
WARM UP AND COOL DOWN – EFFECTS ON VASCULAR SYSTEM

2. FIVE MECHANISMS HELP MAINTAIN VR DURING EXERCISE:
VENOUS RETURN
VR IS THE DEOXYGENATED BLOOD RETURNING TO THE HEART
FIVE MECHANISMS HELP MAINTAIN VR DURING EXERCISE:
POCKET VALVES
SKELETAL MUSCLE PUMP
RESPIRATORY PUMP
SMOOTH MUSCLE
GRAVITY

3. BLOOD POOLING
INSUFFICIENT PRESSURE TO PUSH BLOOD BACK TOWARDS THE HEART CAUSES BLOOD POOLING (BLOOD SITS IN POCKET VALVES OF VEINS)
ACTIVE COOL DOWN PREVENTS POOLING AFTER EXERCISE BY MAINTAINING THE MUSCLE AND RESPIRATORY PUMPS.

4. STARLING’S LAW OF THE HEART
SV / Q IS DEPENDENT ON VR
IF VR INCREASES, SV / Q INCREASES
IF VR DECREASES, SV / Q DECREASES

5. REDISTRIBUTION OF Q AT REST 15 – 20% OF RESTING Q GOES TO MUSCLES
80-85% SUPPLIES BODY’S ORGANS (KIDNEYS, LIVER, STOMACH, INTESTINES)

6. REDISTRIBUTION OF Q EXERCISE 80-85% Q SUPPIED TO WORKING MUSCLES
DECREASED % TO ORGANS
BLOOD SUPPLY TO BRAIN MAINTAINED
INCREASED BLOOD TO SKIN DURING LOW INTENSITY X – REDUCE BODY TEMP.
REDISTRIBUTION OF Q – VASCULAR SHUNT
SKELETAL MUSCLE ARTERIOLES AND PRE-CAPILLARY SPHINCTERS VASODILATE, INCREASE BLOOD TO WORKING MUSCLES
ORGAN’S ARTERIOLES AND PRE-CAPILLARY SPHINTERS VASOCONSTRICT, DECREASING BLOOD FLOW TO ORGANS

7. VASOMOTOR CONTROL CENTRE
VASOMOTOR CONTROL CENTRE (VCC) LOCATED IN MEDULLA OBLONGATA
CHEMO AND BARORECEPTORS STIMULTATE VCC
VCC STIMULATES SYMPATHETIC NS, WHICH CONTROLS BLOOD VESSEL LUMEN DIAMETER OF ORGANS AND MUSCLES

8. 02 TRANSPORTATION
97% WITHIN PROTEIN HAEMOGLOBIN, PACKED WITH RBC’S, AS OXYHAEMOGLOBIN (Hb02)
3% WITHIN BLOOD PLASMA

9. C02 TRANSPORTATION 70% DISSOLVED IN WATER A CARBONIC ACID
23% CARBOAMINOHAEMOGLOBIN (HbCO2)
7% DISSOLVED IN PLASMA

10. WARM UP - VASCULAR
GRADUAL INCREASE IN BLOOD FLOW / Q DUE TO VASCULAR SHUNT:
VASOCONTRICTION OF ARTERIOLES / PRE-CAPILLARY SPHINCTERS TO ORGANS
VASODILATION OF MUSCLE ARTERIOLES / PRE-CAPILLARY SPHINCTERS INCREASING BLOOD FLOW TO MUSCLES
INCREASED BODY TEMP / MUSCLE TEMP:
INCREASING ENZYME ACTIVITY REQUIRED FOR MUSCLE CONTRACTIONS
DECREASES BLOOD VISCOSITY, IMPROVING BLOOD FLOW TO MUSCLES, INCREASING DISSOCIATION OF O2 FROM HAEMOGLOBIN
DECREASED ONSET BLOOD LACTATE ACCUMULATION (OBLA)

11. COOL DOWN - VASCULAR
KEEPS METABOLIC ACTIVITY ELEVATED, WHICH GRADUALLY DECREASES HR AND RESPIRATION
MAINTAINS RESPIRATORY / MUSCLE PUMP WHICH:
PREVENTS BLOOD POOLING
MAINTAINS VR
MAINTAINS BLOOD FLOW (SV / Q) - SUPPLYING O2
MAINTAINS BLOOD PRESSURE
KEEPS CAPILLARIES DILATED TO FLUSH MUSCLES WITH OXYGENATED BLOOD WHICH:
INCREASES THE REMOVAL OF BLOOD, MUSCLE LACTIC ACID AND CO2.

12. KEY WORDS SMOOTH MUSCLE VASODILATE VASOCONSTRICT VENODILATE
VENOCONSTRICT
PULMONARY
SYSTEMIC
POCKET VALVES
VASCULAR SHUNT