Answer:
1 and 5,
2 and 6,
3 and 4
Explanation:
Intestinal phase: stomach empties and decreases secretions
The intestinal phase is the phase where stomach empties its contents(chyme) and decreases secretion. In this stage the duodenum responds to arriving chyme and moderates gastric activity through hormones and nervous reflexes.
The Chyme is the semi-fluid mass of partly digested food that is expelled by the stomach, through the pyloric valve, into the duodenum.
Gastric phase: stomach secretes juice and mixes food into chyme
The gastric phase is a period in which swallowed food and semi-digested protein ( peptides and amino acids ) activate gastric activity which secretes juice and mixes food into chyme. About two-thirds of gastric secretion occurs during this phase.
Cephalic phase: prepares stomach for arrival of food
The cephalic phase of digestion is the gastric secretion that occurs prior to when food enters the oral cavity. Cephalic phase result from the ignition of visual, olfactory, and auditory inputs to the brain and also induce anticipatory responses i.e prepare the gastrointestinal tract for the meal.
This is false. Organisms may play several important roles in an ecosystem. Consider for example and ocean shore environment occupied by a particular species of crab. The crabs are scavengers and eat any organic matter they encounter. They therefore play an important role in the cycling of nutrients in the ecosystem. The crabs are however also an important source of food for a range of other species occupying the same habitat, including octopi, certain fishes and sea otters. Therefore, the crabs are an important part of the food web in the ecosystem. Many species similarly occupy multiple important roles in an ecosystem.
