The nutrients are essential for biosynthesis. To run life human beings and other organisms performs some key functions termed as nutrition. This is one of the basic functions of life in which includes intake of food, digestion, absorption, assimilation and egestion of food. These exist mainly three categories of substances which provide energy to body when we take food. These substances and their characteristics are discussed below.
Sunday, December 3, 2017
The nervous system
The nervous system is an organ system containing a network of specialized cells called neurons that coordinate the actions of an animal and transmit signals between different parts of its body. The nervous system in humans consists of three parts, central nervous system, peripheral nervous system and automatic nervous system.
Circulatory System
• The circulatory system is an organ system that passes nutrients (such as amino acids, electrolytes and lymph), gases, hormones, blood cells, etc. to and from cells in the body. The circulatory system help fight diseases, stabilize body temperature and pH, and to maintain homeostasis.
• The discovery of blood circulation or blood flow was done by William Harvey in 1628.
Major organ systems
• Circulatory system: pumping and channeling blood to and from the body and lungs with heart, blood, and blood vessels.
• Digestive System: digestion and processing food with salivary glands, esophagus, stomach, liver, gallbladder, pancreas, intestines, rectum, and anus.
• Endocannabinoid system: neuromodulatory lipids and receptors involved in a variety of physiological processes including appetite, pain-sensation, mood, motor learning, synaptic plasticity, and memory.
• Digestive System: digestion and processing food with salivary glands, esophagus, stomach, liver, gallbladder, pancreas, intestines, rectum, and anus.
• Endocannabinoid system: neuromodulatory lipids and receptors involved in a variety of physiological processes including appetite, pain-sensation, mood, motor learning, synaptic plasticity, and memory.
Human Blood
• Human blood is the fluid circulated by the heart through the human vascular system.
• There are three cellular components of human blood: red blood cells (r.b.c.), white blood cells (w.b.c.), and platelets.
Introduction to Zoology
Zoology – The systematic study of the structure, form and distribution of animals is called Zoology.
The animal kingdom can be classified over two sub groups – 1. Unicellular animal; and 2. Multi-cellular animal.
The animal kingdom can be classified over two sub groups – 1. Unicellular animal; and 2. Multi-cellular animal.
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