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The human body is the entire structure of a human being. It is composed of many different types of cells that together create tissues and subsequently organs and then organ systems. The external human body consists of a head, hair, neck, torso (which includes the thorax and abdomen ), genitals, arms, hands, legs, and feet.
According to The National Institute Of Health, there's a “7.4% increase in [heart rate] from more than 5 min prior to the start of exercise at 95% maximal work-rate." This is all known as the ...
Human growthand development. Development of the human body is the process of growth to maturity. The process begins with fertilization, where an egg released from the ovary of a female is penetrated by a sperm cell from a male. The resulting zygote develops through mitosis and cell differentiation, and the resulting embryo then implants in the ...
The human skin is the outer covering of the body and is the largest organ of the integumentary system. The skin has up to seven layers of ectodermal tissue guarding muscles, bones, ligaments and internal organs. Human skin is similar to most of the other mammals ' skin, and it is very similar to pig skin. Though nearly all human skin is covered ...
Muscular system. The muscular system is an organ system consisting of skeletal, smooth, and cardiac muscle. It permits movement of the body, maintains posture, and circulates blood throughout the body. [ 1] The muscular systems in vertebrates are controlled through the nervous system although some muscles (such as the cardiac muscle) can be ...
About 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium. All 11 are necessary for life. The remaining elements are trace elements, of which more than a dozen are ...
cardiovascular system. endocrine system. (missing exocrine system) muscular system. Clockwise from top left: lymphatic system. respiratory system. urinary system. female reproductive system. male reproductive system.
v. t. e. Physiology ( / ˌfɪziˈɒlədʒi /; from Ancient Greek φύσις (phúsis) 'nature, origin' and -λογία ( -logía) 'study of') [ 1] is the scientific study of functions and mechanisms in a living system. [ 2][ 3] As a subdiscipline of biology, physiology focuses on how organisms, organ systems, individual organs, cells, and ...