skeleton
(Science: anatomy) A solid or fluid system which allows muscles to relax after contracting (in general, because there is an opposing muscle which pulls the skeletal part in the opposite direction when it contracts).
The skeletal system may also be a support structure or a form of protection. Types of skeletons include hydroskeletons and exoskeletons.
This tutorial describes the sigmoid curve, annual plant growth, tree growth, human growth, and insect growth as the growth curves for the corresponding organisms. Read this tutorial to learn more about the different growth patterns...
Plant cells have plastids essential in photosynthesis. They also have an additional layer called cell wall on their cell exterior. Although animal cells lack these cell structures, both of them have nucleus, mitochondria, endoplasmic reticulum, etc. Read this tutorial to learn plant cell structures and their roles in plants...
Leaves are the major photosynthetic organ of a plant. Apart from that, they are also crucial to water movement. In this tutorial, various plant processes are considered in more detail. It also includes topics on leaf arrangements, leaf types, leaf structure, leaf color, abscission, and importance to humans...
The hominid family diversified from the apes around 6 to 8 million years ago. Since then, the evolutionary path has proved to be nothing short of phenomenal. This tutorial elucidates the emergence of the hominid family from where the human ancestral line came from...
Some of the body movements can be controlled at will, others cannot. The body has a motor program, which is the pattern of neural activities required to perform a movement. Learn more about this topic in this tutorial. Find out the mechanisms involved in length-monitoring systems, alpha-gamma coactivation, and withdrawal reflex...
