In the mammalian respiratory system,<unk>  is normal, good, unlabored breathing, sometimes known as quiet breathing or resting respiratory rate. In<unk> , expiration employs only the elastic recoil of the lungs.<unk>  is the natural breathing in all mammals, including humans.<unk>  does not require any volitional effort whatsoever, but occurs whenever a mammal is in a natural state of relaxation, i.e. when there is no clear and present danger in their environment. When a mammal perceives potential danger,<unk>  stops, and a much more limited and labored form of breathing—shallow breathing—occurs.<unk>  is an efficient and effective form of breathing, which maximizes air intake, and minimizes muscular effort. During<unk> , neural output to respiratory muscles is highly regular, with rhythmic bursts of activity during inspiration only to the diaphragm and external intercostal muscles.
Eupnea
Cyclospasm
Cornea
Apnea
Orthopnea
Bronchospasm
Mydriasis
Oliguria