If plant population is reduced immensely, there would be a surplus of CO2 in the atmosphere because of the lack of plants taking in the CO2 to release oxygen.
Carrier proteins pick up specific molecules and take them through the cell membrane against the concentration gradient. Examples of active transport include: uptake of glucose by epithelial cells in the villi of the small intestine. uptake of ions from soil water by root hair cells in plants.
Homeostatic control mechanisms are typically controlled instinctively by the nervous system.
The nervous system maintains homeostasis by regulating and controlling the other components of the body. A deviation from a usual set points functions as a stimulus to a receptor that transmits nerve impulses to a monitoring center in the brain.
Along with the nervous system, the endocrine system synchronizes the functions of the body to sustain homeostasis at the time of exercise and rest.
