Human is the genus of primate, a type of great ape that is distinguished by bipedalism, an exceptionally large brain, and exceptional cognitive abilities.
Our modern species of humans evolved from earlier Homo sapiens who moved out of Africa about 80,000 to 50,000 years ago. They had larger brains than their ancestors, which made them more adaptable to an increasingly harsh and unpredictable environment.
They also had much more complex social and cooperative behaviour, which helped them survive on the move and cover a wider area in a shorter period of time. Some of their achievements included making specialized tools, using them to make other tools, constructing shelters, building broad social networks, and exchanging resources over wide areas.
Aside from these, our ancestors also produced art, music, personal adornment, rituals, and a very complex symbolic world that they shared with their tribes.
The human body consists of approximately 200 bones, a large number of muscles, organs, and other structures that allow our bodies to move, breathe, and take in food, oxygen, and waste products. We also have a system of nerves that relay electrical impulses between the brain, spinal cord, and our senses.
Anatomists divide our bodies into ten basic systems: Skeletal, Muscular, Nervous, Respiratory, Cardiovascular, Lymphatic, Endocrine, Digestive, Reproductive, and Immune. These systems work together to maintain our health and give us the ability to function normally.
Blood is a liquid that provides our bodies with the nutrition, oxygen, and waste removal they need to survive and thrive. It is constantly circulating throughout our body, with a fluid called plasma accounting for about half of its content.
Many proteins and other substances are suspended in the blood, allowing it to circulate smoothly through our veins and arteries. These proteins help the blood clot, transport substances through the bloodstream, and perform other important functions.
Our blood also contains white cells, red cells, and platelets that help our bodies to fight off germs, infections, and other foreign substances. We also have a variety of glands that produce hormones to regulate our internal functions.
Aside from these, our bodies have many other systems that keep us healthy and enable us to carry out our day-to-day activities. Our reproductive and regenerative systems are just a few examples.
We also have a system of 79 organs (anatomical terms for organs) that helps our body to function efficiently and provide us with vital nutrients. This count is very superficial and it should not be taken too seriously, but it can be helpful to learn about the different systems of our bodies.
The skeleton is the main structure of the human body and it acts as a scaffold to support the rest of the body. It is a complex structure that is able to adapt and change as required to allow us to move around and to protect our organs and bones from injury or illness.
The skeletal system is divided into the bones, joints, ligaments, tendons, and other soft tissues. The bones are strong and flexible, enabling the body to move through space. They also provide stability, protection, and support for the muscles of the body and they can store different substances in them.
