Anatomy of hair

-
Hair structure


Each hair has a hair shaft and a hair root. The shaft is the visible part of the hair that sticks out of the skin. The hair root is in the skin and extends down to the deeper layers of the skin. It is surrounded by the hair follicle (a sheath of skin and connective tissue), which is also connected to a sebaceous gland.

Each hair follicle is attached to a tiny muscle (arrector pili) that can make the hair stand up. Many nerves end at the hair follicle too. These nerves sense hair movement and are sensitive to even the slightest draft.

At the base of the hair, the hair root widens to a round hair bulb. The hair papilla, which supplies the hair root with blood, is found inside the bottom of the hair bulb. New hair cells are constantly being made in the hair bulb, close to the papilla.


Comments

Post a Comment

Popular posts from this blog

Post basic BSC nursing 1st year question paper with answers

-
Image
B.Sc. NURSING [Post Basic (Ist year)] BIOCHEMISTRY & BIOPHYSICS Time: 3 hrs. M.M.: 75 Note: 1. Attempt all questions. 2. No supplementary sheet shall be allowed/provided. The Student must write Q.P. Code in the space provided on the Title Page of the respective Answer Book. Section-A (Biochemistry) Q.1. a. Define Enzymes. (2) b. Write the properties of Enzymes.(4) c. Explain the factors effecting the Enzyme activity. (4) OR a. Define Amino acids.(2) b. List down the properties of Amino acids. (4) c. Explain the functions of Amino acids (4) Q.2. Differentiate between: (2.5 x 4 = 10) a. Monosaccharides and Disaccharides. b. Glycogenesis and Glycogenolysis. c. Saturated fats and Unsaturated fats. d. Ribo nucleic acid (RNA) and Deoxyribo nucleic acid (DNA). (3x2=6) Q.3. Describe briefly (any two): a. Fibrous Proteins. b. Glucose tolerence test. c. Functions of water in human body. d. Glycemia. (4x3= 12) Q.4. Write short notes on any four of the following: a. Precautions for handling sp...
Read more

General knowledge question and answer about HUMAN BODY PART'S

-
Image
General knowledge question and answer about human body parts 1. When you blush, the lining of your stomach is also turn red. [Because you're embarrassed, your body releases adrenaline as part of the fight or flight response. This causes your blood vessels to dilate, which causes your cheeks to redden, and your stomach lining too.] 2.The largest organ in the human body is skin. [ The skin is the largest organ of the body. The skin and its derivatives (hair, nails, sweat and oil glands) make up the integumentary system. One of the main functions of the skin is protection. It protects the body from external factors such as bacteria, chemicals, and temperature.] 3.The human body is composed of carbon, hydrogen, calcium, Phosphorus, oxygen and nitrogen [About 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen , calcium, and phosphorus . Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium...
Read more

System in the Human body

-
Image
These 11 major organ systems of human body are:- 1. Circulatory or cardiovascular system.  2. Respiratory system.  3. Nervous system. 4. Skeletal system  5. Digestive system or gastrointestinal system. 6. Reproductive system (female and male) 7. Muscular system. 8. Lymphatic system. 9. Urinary system or excretory system. 10. Integumentary system.  11. Endocrine system. 1. cardiovascular system or circulatory system:- The heart and blood are major parts of the circulatory system. All components contribute to oxygen and nutrient delivery throughout your body. ■The circulatory system consists of four major components: ●Heart  ●Arteries ●Veins ●Blood 2. Respiratory system :- The respiratory system is the network of organs and tissues that help you breathe. It includes your airways, lungs and blood vessels. The muscles that power your lungs are also part of the respiratory system. These parts work together to move oxygen throughout the body and clean out waste gases like carbon dioxide. ■Th...
Read more