Answer:
Physical contact
Explanation:
Mostly through phsyical contact. Hugging, shaking hands, kissing, etc..
Touching raw foods and then touching objects without washing your hand. Then someone comes along and touches that door knob and touches their face
Cartilage is a rubber like tissue, protects the ends of long bones at the joints component of the rib cage, the ear, the nose and the bronchial tubes
You should check if you friend have oral herpes aand if he does them go to the octor
Short answer:
Valve which permits blood to flow from the right atrium to the right ventricle is tricuspid valve
Long answer:
The right side of the heart has lower pressure compare to the left side. There is a valve that support the lower pressure so the blood can move easily from the right atrium to the left ventricle. The valve is called tricuspid valve. It's called "Tri" because there are 3 flaps/leaflets on the valve.
For your information, the left side of the heart only has 2-leaflet valve, which make smaller circular opening compare to the 3-leaflet valve on the right side. That's because the left side has higher pressure than the right side.
