Our sense of depends on olfactory cells located high in the roof of the nasal cavity.

Sense of smell

Sense of smell is known to be part of the chemosensory system or chemical senses. It also a warning system that alert to danger signals such as fire, gas leakage or spoiled food. Thus, the sense of smell comes from the specialized sensory cells known as olfactory sensory neurons.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.