SOC 15: STRUCTURE OF THE HEART Flashcards
WHAT ARE THE 3 FUNCTIONS OF THE CV SYSTEM ?
- transportation and diffusion of oxygen, carbon dioxide and nutrients
- helps to clot blood and stop bleeding
- controls the bodys temperature
WHAT IS VASODILATION ?
When veins swell up or dilate widening of the internal diameter of the blood vessel to increase blood flow
WHAT IS VASOCONSTRICTION ?
When veins shrink, it narrows the internal diameter of the blood vessek whcih decreases blood flow
WHAT IS THE CARDIOVASCULAR SYSTEM
The cardiovascular system is formed by our heart and blood vessels. Cardio means the heart and vascular means blood vessels
WHY IS THE TRANSPORT OF OXYGEN, CARBON DIOXIDE AND NUTRIENTS IMPORTANT AROUND THE BODY
The heart pumps oxygen around the body, which is used in respiration ams the production of energy in cells so the harder tha muscles work, the harder the the heart has to work. The system also carries away waster products such as carbon dioxide and delivers nutrients and water
WHY IS CLOTTING BLOOD IMPORTANT
Blood contains platelets which help clots our blood which helps form scabs helping us to stop bleeding and start healing but also it also stops infections as it also sends white blood cells
WHY IS CONTROLLING BODY TEMPERATURE IMPORTANT
If you get too hot the blood vessels close to the skin get bigger which allows blood is diverted to the surface to radiate more heat out the body
If you become too cold your vessles get smalled to avoid heat from your body getting lost
WHAT IS VASCULAR SHUNTING
A process that increases blood flow to active areas during exercise by diverting blood away from inactive areas which is achieved by vasodilation and vasoconstriction. As a result of exercise making our body work harder, it demands your heart rate to increase and your muscles require more oxygen. To bring a change to your heart rate in your heart rate, your body releases a hormone called adrenaline which makes the heart beat faster and diverts blood away from organs and to the muscles
WHAT IS THE CARDIO RESPIRATORY SYSTEM
The interaction of the heart and lungs to supply oxygen to muscled during exercise
WHAT ARE THE TWO STAGES WHEN HEART PUMPS BLOOD
The heart beats in a ‘lub dub’ rythm
The first phase is the systolic phase and the second stage is the diastolic phase
WHAT HAPPENS IN THE SYSTOLIC PHASE
- blood is pumped both artia into the ventricles (lub)
- then both ventricles contract (dub)
- this pushed deoxygenated blood to leave the right ventricle to the lungs
- oxygenated blood in the left ventricle then leaves by the aorta to the body
WHAT HAPPENS IN THE DIASTOLIC PHASE
- this is where the heart is relaxing and refilling the atria with blood
WHAT IS BLOOD PRESSURE
Blood pressure is a measure of the force that your heart uses to pump the blood around the body
WHAT IS THE IMPORTANCE OF RED BLOOD CELLS
Red blood cells transports oxygen from the lungs to the body’s cells and carbon dioxide from the cell to the lungs. They also contain haemoglobin which stores oxygen and carbon dioxide which us important as our muscles require more oxygen when exercising
WHAT IS THE IMPORTANCE OF WHITE BLOOD CELLS
The white blood cells are transparent cells that act as the defence system of the body, they also produce antibodies to fight against infections and diseases when they are injured, etc
