THE VALVULAR SYSTEM OF THE HEART.
Valves are present in the heart to prevent the backflow of blood. This is known as the valvular system of the heart. This is categorized into two;
The atrioventricular valves
The semilunar valves.
The atrioventricular valves prevents the regurgitation of blood into the heart. It consists of the following;
tricuspid valve: this is located at the right side of the heart.
It contains three cusps.
the bicuspid valve: It is located at the left side of the heart.
It contains two cusps.
Did you know: The structure with supports the presence of these valves is known as the chordate tendinea.
The Semilunar valve are located between the arteries that carry blood away from the heart and the ventricle. It consists of the following:
Aortic valve: It is located in the left side of the heart.
This helps in preventing the backflow of blood from the aorta into the left ventricle.
Pulmonary valve: this is located in the right side of the heart.
It prevents the regurgitation of blood from the pulmonary trunk into the left ventricle.
THE PHYSIOLOGICAL PROPERTIES OF THE HEART
The heart functions properly by exhibiting the following properties or characteristics:
Conductibility: this is the ability of the heart to spread the flow of impulses within the conductive system and the myocardium.
Contractility: ability to respond by contracting to a stimulus.
Excitability: it is the property to respond to stimulus
Automaticity: this is the ability of the conductive system of the heart to respond to electrical impulses
Hypertension is the persistent elevation of blood pressure above 140/90mmHg(millimeter mercury). It varies with blood pressure I.e
Hypertension is classified into 2 whichare:
1-primary whose specific cause is unknown but have some factors which can be heredity, Emotional stress, Obesity etc.
2-Secondary hypertension which is caused by abnormalities in the body e.g structural defects of the heart, renal/kidney problem, oral contraception etc.
There are different signs and symptoms of hypertension which are
Dizziness, occipital headache, light headache, visual changes, insomia, shortness of breath etc.
Complications of hypertension are: heart failure, blindness, retina hemorrhage etc.
If you notice the above symptoms, try to see your doctor and to avoid hypertension, we need to watch our diet by reduction of cholesterol/fat intake, reduction of sodium (salt) intake, alcohol, coffea and tea intake.
Secondly, physical and mental rest is encouraged to conserve energy and
Thirdly prevent constipation and straining during defecation.