An injury in which the epidermis remains intact, but blood vessels and cells in the dermis are injured, is called a(n):a. contusion. b.abrasion. c.concussion. d.avulsion.

A- a  medical term for common bruise.

Explanation:

This is a type of closed wound   inflicted by a blunt object. Therefore the epidermis remains intact but there is disruption of the underlying dermis structure. Blood usually leaks from the damaged capillaries into the surrounding  areas.And this marked the meaning of contusion.

It usually affects both the bones and soft tissues.When it  occurs in the bone it is  bone contusion, muscles as muscle contusion  or as in the question;to the skin as skin contusion.

Adequate rests, cold compression, elevation of the affected part. or compression with bandage are the methods of treatment.

Bone contusion takes longer time to heal with X-ray examination,but other forms heal naturally.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

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