What organ lies superior to the diaphragm and left of the mediastinum?

Diaphysis. The diaphysis is the tubular shaft that runs between the proximal and distal ends of the bone. The distal region of the humerus is the lower area of the humerus that is closest to the elbow.

Therefore, a fracture in the distal region of the humerus would affect the diaphysis.

Choice A is wrong because epiphysis is the wider section at each end of the bone that is filled with spongy bone.

The epiphysis is not part of the shaft of the bone.

Choice B is wrong because endosteum is the delicate membranous lining of the medullary cavity, where bone growth, repair, and remodeling occur.

The endosteum is not a region of the bone, but a tissue that lines the inner surface.

Choice C is wrong because perichondrium is a layer of dense irregular connective tissue that surrounds the cartilage of developing bone.

The perichondrium is not a part of the bone itself, but a covering that helps with nourishment and growth.

The left lung lies superior to the diaphragm and left of the mediastinum, which is the space between the lungs that contains the heart and other structures. The left lung is also smaller than the right lung because of the cardiac notch, which accommodates the heart.

Choice A is wrong because the spleen is an abdominal organ that lies inferior to the diaphragm and left of the stomach.

Choice C is wrong because the stomach is also an abdominal organ that lies inferior to the diaphragm and left of the spleen.

Choice D is wrong because the left kidney is another abdominal organ that lies inferior to the diaphragm and posterior to the spleen.

Connective tissue is the most abundant type of tissue in the human body. It is widely distributed and varied, and it includes fibrous tissues, fat, cartilage, bone, bone marrow, and blood.

Choice A is wrong because muscle tissue is not the most abundant type of tissue in the human body. It constitutes around 40% of total body weight and has around 700 muscles.

Choice B is wrong because nervous tissue is not the most abundant type of tissue in the human body. It consists of neurons and neuroglia that transmit and process information.

Choice C is wrong because epithelial tissue is not the most abundant type of tissue in the human body. It covers the body and many of its parts, and forms glands.