Thecellis the basic living unit of the human body—indeed, of all organisms. The human body consists of trillions of cells, each capable of growth,metabolism, response tostimuli, and, with some exceptions, reproduction. Although there are some 200 different types of cells in the body, these...
Body shape and composition are heterogeneous among humans with possible impact for health. Anthropometric methods and data are needed to better describe the diversity of the human body in human populations, its age dependence, and associations with healt
The bones of your body are divided into five different types based on their shape and function: long bones, short bones, flat bones, irregular bones, and sesamoid bones. Each type of bone has a specific role in the body. For instance, long bones, such as the femur (thigh bone) and hu...
The spinous layer is succeeded by the granular layer, orstratum granulosum, with granules of keratohyalin contained in the cells. These small particles are of irregular shape and occur in random rows or lattices. The cells of the outer spinous and granular layers also contain much larger, lame...
Natural, geographical barriers have historically limited the spread of communicable diseases. This is no longer the case in today’s interconnected world, paired with its unprecedented environmental and climate change, emphasising the intersection of evo
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In mammals, an organism consists mainly of two cell types, somatic cells, and germ cells. Based on the concept of the germline proposed by early biologist August Weismann,1the somatic cells die along with the individual, in contrast, the germ cells can pass both genetic and epigenetic informat...
Human memory happens in many parts of the brain at once, and some types of memories stick around longer than others.
Shape and location The human heart and cardiovascular system explainedThe heart, located between the lungs, powers the circulatory system. See all videos for this article Britannica Quiz Facts You Should Know: The Human Body Quiz The adult human heart is normally slightly larger than a clenched fi...
Although there are many types of cells in the human body, they are organized into four broad categories of tissues: epithelial, connective, muscle, and nervous. Each of these categories is characterized by specific functions that contribute to the overall health and maintenance of the body. A di...