A super cold spell swept across China this winter. Some parts of the body are more susceptible to frostbite in this windy and dry weather. Several medical professors share their medical knowledge with us.

Some organs of human beings are easily to frostbite in this windy and dry winter. (File photo)

No. 1 "The prostate is a fragile organ for men. The sympathetic nerve will increase excitability and cause glands contraction when it becomes cold, thus leading to poor local blood circulation and chronic hyperaemia," said Guo Jun, the director of Xiyuan Hospital, China Academy of Traditional Chinese Medicine.

Vessels will shrink and turn to be fragile in the cold and dry winter. (File photo)

No. 2 "The sympathetic nerve will increase excitability when it is stimulated by chilly weather. Vessels will shrink and become fragile. Elderly people who have less flexible vessels than young persons have more risk of getting paroxysmal diseases such as cerebral hemorrhages," said Chen Yundai, professor and director of cardiovascular medicine of the PLA General Hospital.

Heart seems like the generator of people's body. (File photo)

No. 3 The heart seems like the generator of people's bodies. "Physiological functions of human beings respond slowly in winter when there is a big difference between indoors and outdoors. Cold weather puts a greater burden on people's hearts, sometimes even causing stenocardia or myocardial infarction," said Wang Wen, professor at Fuwai Cardiovascular Hospital, China Academy of Traditional Chinese Medicine.

Lung works as the gas exchange station of people's body. (File photo)

No. 4 People are prone to respiratory diseases when the cold, dry air enters the body through the lungs, which work as the 'gas exchange station'.

No. 5 Metabolism slows down in winter. Eating too many indigestible foods such as fish, meat or foods of highly nutritious value is an extra burden on the stomach.

No. 6 The nose is the 'window' and breathing inlet of human beings' respiratory system. "Winter is the high-incidence season of chronic rhinitis and allergic rhinitis due to the nasal mucosa coming into direct contact with the cold air and secreting less mucus," said Song Haitao, director of the ear-nose-throat department at Beijing Hospital.

No. 7 Ears, nose, hands and feet are all located at the nerve endings of human bodies, which have less blood flow and easily catch cold. Ears are covered with thin skin and have the least cold-tolerance of all the parts of the face.