a cell is the smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane. Microscopic organisms typically consist of a single cell, which is either eukaryotic or prokaryotic.
what is the difference between plant and animal cells
Although, the overall function of the cell is the same, there are some important differences between animal and plant cells. The big difference is that plant cells have an organelle called chloroplast. Chloroplasts contain a pigment called chlorophyll (which gives the plant its green color).
What are the components and functions of the digestive, circulatory, and respiratory systems in humans and how these systems interact.
The job of the respiratory system is the exchange of gases between the body and the outside air. This process, called respiration, actually consists of two parts. In the first part, oxygen in the air is drawn into the body and carbon dioxide is released from the body through the respiratory tract. In the second part, the circulatory system delivers the oxygen to body cells and picks up carbon dioxide from the cells in return. The use of the word respiration in relation to gas exchange is different from its use in the term cellular respiration. Recall that cellular respiration is the metabolic process by which cells obtain energy by “burning” glucose. Cellular respiration uses oxygen and releases carbon dioxide. Respiration by the respiratory system supplies the oxygen and takes away the carbon dioxide
The digestive system consists of organs that break down food and absorb nutrients such as glucose. Organs of the digestive system are shown in the picture below Most of the organs make up the gastrointestinal tract. The rest of the organs are called accessory organs.
The fluid part of blood is called plasma. It is a watery golden-yellow liquid that contains many dissolved substances and blood cells. Types of blood cells in plasma include red blood cells, white blood cells, and platelets.
- Paramecia feed on microorganisms like bacteria, algae, and yeasts. To gather food, theParamecium uses its cilia to sweep prey organisms, along with some water, through the oral groove, and into the mouth opening. The food passes through the cell mouth into the gullet.