Activation of the receptors by stimuli is called perception sensation adaptation habituation

sensation

Sensation can be defined as the activation of sensory receptor cells by the stimulus. However, the processing of the sensory stimuli into a meaningful pattern can refer to as perception. Thus, not all sensation is usually perceived but perception is dependent on sensation.

the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.

the contamination

we are putting to many trash.