... . The only way is through its digestive system. There, chemical energy can be absorbed and used for the growth of cells. The original form of this chemical energy is just plain food. The digestive tract is designed to break this food down into useful chemical energy. This digestive tract is considerably one long tube leading ... eat it again. After deglutination, The bolus travels through the pharynx. The special thing about the pharynx is that it is a pathway for both the digestive and reparatory systems. The epiglottis closes the path to the trachea which also leads to the dilation of ...

• Word Count: 1517
• Approx Pages: 6
• Grade Level: High School

... organic molecules that are consumed must be degraded first into simpler compounds through hydrolysis reactions; this process of degradation is called digestion. The digestive system in humans and other vertebrates consists of a tubular gastrointestinal tract and accessory digestive organs. The initial components of the gastrointestinal tract are the mouth and the pharynx, which is the common passage of the oral ... layer, the serosa, covers the external surface of the tract. Nerve plexuses in the submucosa and muscularis help to regulate the activities of the gastrointestinal tract. Spe...

• Word Count: 9019
• Approx Pages: 36
• Has Bibliography
• Grade Level: Undergraduate

Classification of Living Things Classification is defined as identification, naming, and grouping of organisms into a formal system based on similarities such as internal and external anatomy, physiological functions, genetic makeup, or evolutionary history. ... the external shapes and sizes of organisms as well as the anatomy and function of internal organs and organ systems, such as the digestive or reproductive systems. Biochemists study and compare the molecular interactions within an organism that enable it to grow, make and store energy, ... of protists, and they live in many differe...

• Word Count: 2632
• Approx Pages: 11

... as tissues. A tissue is a group of similar cells that preform similar functions. Different tissues form many different tasks. For example, a kind of tissue is made up of cells that produce digestive enzymes in the pancreas, and the cells in an eye respond to light. Most multicellular organisms have four main types of tissues: muscle, epithelial, nerve, and connective. Some tasks in ... a group of organs that work together to preform one function. There are many organ systems in our body. We have a muscular system, skeletal system, nervous system, and circulatory system. Multicellular Or...

• Word Count: 4152
• Approx Pages: 17
• Grade Level: High School