Respiratory system.
The integumentary system is your skin that covers your body.
The external and internal nares are pretty interesting due to the fact that not alot of people know about that structure. Also the nictitating membrane is interesting as welll.
Some of the body parts that are visible on the dorsal surface of a frog include the head, trunk and limbs. Other parts are the external nares, the tympanic membrane and the anus.
This body system that is responsible for the exchange of gases between the blood and the external environment.
I think you're thinking of the integumentary system to which the largest organ of the human body, skin, belongs to.
The nervous system coordinates the body's response to changes in the internal and external environments The sense organs are part of the peripheral nervous system..
integumentary system
Senses and digestive
Information entering the central nervous system from the external environment is called external stimuli. External stimuli are factors which are detected by the body and communicated to the central nervous system such as temperature and scents.
by doing external work on the system eg;refrigerator
The nervous system.
The nervous system.