Human characteristics include aspects such as standing upright, using tools to gather food or kill animals, and evolving different body shapes. Other aspects include brains that are continually growing bigger and more complex, using symbols and language, and developing a social system.
Over the past several million years of evolution, certain unique characteristics have defined the human species. Perhaps the most significant is the ability of the species to stand and walk in an upright position. This enables the human being to hunt, move easily from place to place and defend themselves from attacks by predators.
The human body and brain evolved and changed more than any other species. The shape of the body evolved according to the regions and climates and helped the species to survive. The human brain from the earliest origins of man to the present day, has expanded and grown in complexity and ability. It has learned to adapt to changing needs and environmental factors, leading to the supremacy of the species. Key human characteristics, such as making and using tools and weapons, developing a system of communication through symbols and sounds, and developing social, political and economic systems of interaction, have contributed significantly to the survival of the species.Learn More
Exhaled air is comprised of approximately 4 to 5 percent less oxygen than was inhaled. The exchange of gases takes place in the alveoli within the lungs in a process called diffusion.Full Answer >
According to Dartmouth's online textbook, "Basic Human Anatomy," the superior orbital fissure is a cleft in the bones of the skull located within the hollows (or orbits) of the eye. Several important nerves pass through this cleft. It is larger and higher than the inferior orbital fissure.Full Answer >
According to WebMD, the bladder is a hollow, muscular sac that stores urine. About the size and shape of a pear, the bladder receives urine from the ureters and expels it through the urethra. While the kidneys filter blood constantly, and therefore produce urine on a continual basis, the urinary bladder stores the urine so that urination can take place periodically instead of being a constant activity.Full Answer >
The skin excretes sweat and dead cells from the body, according to the Franklin Institute. Sweating and dead cell excretion through the skin is a function of the integumentary system, which supports the excretory system.Full Answer >