What is the composition of the secretions of the eccrine glands?
The secretion of eccrine glands is a sterile, dilute electrolyte solution with primary components of bicarbonate, potassium, and sodium chloride (NaCl), and other minor components such as glucose, pyruvate, lactate, cytokines, immunoglobulins, antimicrobial peptides (e.g., dermcidin), and many others.
What is the composition of sweat produced by sweat glands?
The main electrolytes of sweat are sodium and chloride, though the amount is small enough to make sweat hypotonic at the skin surface. Eccrine sweat is clear, odorless, and is composed of 98–99% water; it also contains NaCl, fatty acids, lactic acid, citric acid, ascorbic acid, urea, and uric acid.
What do eccrine sweat glands secrete?
The eccrine sweat gland, which is controlled by the sympathetic nervous system, regulates body temperature. When internal temperature rises, the eccrine glands secrete water to the skin surface, where heat is removed by evaporation.
Which of the following represents a difference between eccrine sweat glands and apocrine sweat glands?
Which of the following represents a difference between eccrine sweat glands and apocrine sweat glands? a) Eccrine sweat glands use exocytosis to make secretions, while apocrine sweat glands do not.
Which of the following best describes the secretions of apocrine sweat glands?
They are the most numerous type of sweat gland; they secrete “true sweat.” Which of the following best describes the skin appendage of apocrine sweat gland? It produces viscous, proteinaceous, and sometimes milky sweat that takes on a musky smell; it is found in axillary and pubic regions.
What is the most important role of the Arrector pili muscles in humans?
Arrector Pili Muscle – This is a tiny muscle that attaches to the base of a hair follicle at one end and to dermal tissue on the other end. In order to generate heat when the body is cold, the arrector pili muscles contract all at once, causing the hair to “stand up straight” on the skin.
Why is the Arrector pili muscle useless?
Arrector Pili This process is vestigial in humans because we don’t have enough hair or fur to make it worthwhile. Fluffing up hair or fur creates pockets to trap air and warm the body. Humans still have the response of the arrector pili muscle pulling up the hair shaft, but we have no use for it, making it vestigial.
What controls the Arrector pili muscle?
Each arrector pili is composed of a bundle of smooth muscle fibres which attach to several follicles and is innervated by the sympathetic branch of the autonomic nervous system. The contraction of the muscle is then involuntary stresses such as cold, fear etc.
What nerve endings are found in the skin?
Free nerve endings are formed by branching terminations of sensory fibers in the skin. The endings are slightly thickened. Although mechanoreceptors, thermoreceptors, and nociceptors are all examples of free endings, nociceptors are the most common type.
Where are nerves located in the skin?
Most of the nerve fibers are found in the mid-dermis and the papillary dermis. The epidermis, blood vessels, and skin appendages such as hair follicles, sebaceous glands, sweat glands, and apocrine glands are innervated by several subtypes of sensory nerves (622, 811).
What are the two main cells found in the epidermis?
The epidermis has three main types of cell:
- Keratinocytes (skin cells)
- Melanocytes (pigment-producing cells)
- Langerhans cells (immune cells).
Which skin layer is the thickest?
What is the largest organ in the human body?
The skin is the body’s largest organ.
What’s the smallest organ in your body?
What’s the smallest organ in the human body? You’ll find the pineal gland near the center of the brain, in a groove between the hemispheres. It’s not an organ like those in the abdominal cavity.
What is the hardest bone in the human body?
The hardest bone in the human body is the jawbone. The human skeleton renews once in every three months.
What is the least important organ in the human body?
Here are some of the “non-vital organs”.
- Spleen. This organ sits on the left side of the abdomen, towards the back under the ribs.
- Reproductive organs.
What is the most useless bone?
The Tailbone: Grandpa didn’t have a tail, but if you go back far enough in the family tree, your ancestors did. Other mammals find their tails useful for balance, but when humans learned to walk, the tail because useless and evolution converted it to just some fused vertebrae we call a coccyx.
Which body part has no bones?
The ears and nose do not have bones inside them. Their inner supports are cartilage or ‘gristle’, which is lighter and more flexible than bone. This is why the nose and ears can be bent.
What are the 3 most important organs?
Vital organs These are the brain, heart, kidneys, liver and lungs. The human brain is the body’s control center, receiving and sending signals to other organs through the nervous system and through secreted hormones.
Which organs can you live without?
You can still have a fairly normal life without one of your lungs, a kidney, your spleen, appendix, gall bladder, adenoids, tonsils, plus some of your lymph nodes, the fibula bones from each leg and six of your ribs.
What are the three most important muscles in your body?
The three main types of muscle include skeletal, smooth and cardiac. The brain, nerves and skeletal muscles work together to cause movement – this is collectively known as the neuromuscular system.