Gravity is a force between any two objects with mass. why doesn’t a person feel a gravitational force between him/herself and another person
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Ответ:
Explanation:
The force of gravity is not a huge force. Put another way, it is most easily observed when the masses are quite large relatively speaking. The Sun and the earth orbiting around the sun serves to measure the force of gravity. The distance is pretty large but masses are unimaginably larger.
The sum has a mass of 2 * 10^30
The earth has a mass of about 6 * 10^24.
The force of gravity between them is 3.5 * 10^22 Newtons roughtly.
We on the other hand have masses of 70 to 100 kig.
The force between humans is F = 6.67 * 10^-11 * 100 * 100 / 1 meter^2
F_humans = 6.67 * 10 ^- 7 Newtons.
The equivalent weight is roughly that of a couple of grains of sand. It's just big enough to register on our senses.
Ответ:
Connective tissue of the tunica media and endothelium of the tunica external
Explanation:
Blood vessels consists of networks that carry blood from the heart to the body cells and back to the heart. It comprises of veins and arteries.
Veins and arteries are made up of three layers and they are tunica intima,tunica media and tunica externa.
The innermost layer is tunica intima, the middle layer is tunica media and the outer layer is tunica externa.
Tunica media contain circular elastic fibers, connective tissues and smooth muscle.
The connective tissue serve as autoregulation of blood, that it help to maintain blood flow.
Tunica externa is the outermost layer that surrond tunica media, it also help to maintain blood flow through the blood vessels.