《醫學英語視聽說（第二版）（大學專業英語繫列教材）》旨在滿足高素質醫學人纔培養目標，進一步深化本科階段大學英語教學改革，把醫學生的語言能力提升與醫學專業知識有機融合，融語言教育與專業教育於一體，讓醫學生通過醫學專業英語學習，掌握用專業語言進行國際交流的學術技能。
本教材有如下特色：
一、選材內容緊跟醫學發展新趨勢。
二、選材全面，涵蓋人體繫統和器官。
設計始於豐富輸入，重在有效輸出。
四、教材配套資源充足，便於教師和學生使用。

盧鳳香,教授,首都醫科大學醫學人文學院院長, 兩次作為主要完成人榮獲北京市高等教育教學成果獎，首批***線上線下混合式一流課程獲得者。
鄭願華，教授，外國語與國際交流學院院長，山東省大學外語教學指導委員會委員, 山東濱州醫學院教學名師, 2016年榮獲煙臺市優秀女知識分子、三八紅旗手稱號。主持省部級課題11項，獲廳局級以上教科研獎勵15項。
奎曉嵐,教授, 內蒙古醫科大學外國語學院院長。中華醫學會教育學會醫學外語學組常務理事,曾獲內蒙古自治區大學外語優秀教學成果一等獎、自治區高教學會突出貢獻個人先進獎。主持多項科研項目，主編多部教材，發表論文20餘篇。
薛英利，副教授，中國中醫藥研究促進會傳統文化翻譯與國際傳播專業委員會常務理事，2016年教育部高等學校青年骨干教師國內訪問學者，陝西省大學外語教學研究會理事，西安醫學院醫學語言與文化研究中心主任。

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Unit One Integumentary System
The finest clothing made is a person's own skin, but, of course, society demands something more than this.
――Mark Twain (1835―1910, American writer)
Introductory Remarks
The integumentary system is made up of skin, hair, nails, and exocrine glands. The major function of the system is the protection that the skin gives to underlying tissues. Skin, only a few millimeters thick, is the largest organ in the body. It keeps most harmful substances out, as well as prevents the loss of body fluids. Extending from the skin, hair and nails reinforce the skin and protect it from environmental damage. The exocrine glands of the integumentary system produce sweat, oil, and wax to cool, protect, and moisturize the skin's surface.

Part I Introduction to the Integumentary System

Think and Talk
Directions: Skin is the largest organ in our body. Do you know its major functions? How does it protect us against threats from the outside world? Discuss the questions with your partner with the help
of the following words.

epidermis dermis waterproof microbe T-cell
bacteria fungi gland sebum sensation

Watch and Do
Task One: Blank Filling
Directions: Watch the video and fill in the blanks according to what you've heard.
Between you and the rest of the world lies an (1) that makes up 16% of your physical weight. This is your skin, the largest organ in your body: laid out flat, it would cover close to 1.7 square meters of ground. Its purpose may seem obvious―to keep our (2) in. But a look beyond the surface (3) that it plays a surprising number of roles in our lives. First, the basics. Skin is the foundation of the integumentary system, which also (4) your hair, nails, and specialized (5) and nerves. Made up of three layers, the epidermis, dermis, and hypodermis, skin’s (6) varies from 0.5 millimeters at its hinnest and up to four millimeters at its thickest. It also carries out three key functions: protecting, regulating, and sensing the world beyond its limits. On a daily basis, its huge surface processes hundreds, if not thousands, of physical (7) , relying mostly on large, pressure-sensitive skin components called Merkel cells. In your fingertips alone, there are 750 Merkel cells per each square-centimeter of skin, coupled with over 2,500 receptors that give you your sense of (8) . This surface is also the body's first major line of defense. Without it, you’d be a soggy mass of tissue and fluids, fatally exposed to the elements. Skin effectively (9) off your insides and also absorbs pressure and shock with flexible collagen that makes up most of its (10) layer.
Task Two: Multiple Choice
Directions: Watch the video again and pick the best answer from the choices marked A, B, C and D.
1. We rely on ( ) to give us our sense of touch.
A. the skin’s surface area
B. the sensitive hairs on the surface of our skin
C. flexible collagen fibers
D. Merkel cells and receptors
2. The epidermis is made up mainly of ( ) .
A. hardened protein called keratin
B. keratinocytes replaced every four weeks
C. cells and microbes
D. Langerhans cells
3. ( ) ensure that the immune system is ready to react when the body is at risk.
A. T-cells
B. Bacteria that inhabit the skin
C. Fungi that inhabit the skin
D. Thousand species of skin microbes including bacteria and fungi
4. About ( ) of the body’s blood supply is circulating through the dermis at any given time.
A. 15% B. 25% C. 50% D. 17%
5. The average human has 5 million hair follicles on ( ) .
A. the scalp
B. the body
C. the body except the palms of hands and soles of feet
D. the scalp, palms of hands and soles of feet
Task Three: Description
Directions: Make a brief description of the integumentary system according to what you've heard.