Sweat glands are made up of a coiled acinar secretory structure in the dermis and a straight duct that connects this acinar structure to the epidermis's surface (Figure 4). The epithelial cells of the duct wall contain abundant mitochondria with well-developed cristae, indicating high metabolic activity. Near the opening of the duct into the skin's surface, there is an intraluminal granular material composed mainly of mucin and salts. This material may play a role in preventing bacteria from entering the duct.
The excretory portion of the sweat gland is called the "acini" which release their contents by exocytosis into the lumen of the duct. Exocytosis is the fusion of small vesicles with the cell membrane, releasing their contents into the space between the cells. These contents include salt and water for secretion into the duct, proteins involved in inflammation, and hormones. The result is a reduction in cell volume and expansion of the intercellular space causing obstruction of the duct. This mechanism allows the body to remove toxic substances from the blood stream without having to use the filtration system of the kidney.
The rate at which you can lose water through your skin depends on several factors such as your size, temperature, how much you sweat, etc.
Sweat glands are coiled tubular structures that regulate the temperature of the human body. Human sweat glands are classified into three types: eccrine, apocrine, and apoeccrine. Eccrine glands are present all over the body and are responsible for water and salt loss through vaporization and perspiration, respectively.
Apocrine glands are found mainly in the skin's dermis layer and secrete an oily substance that helps prevent bacteria and viruses from attaching themselves to the skin. These glands are thought to play a role in body odor because they produce enzymes that break down fatty acids into chemicals that cause malodor.
Apoeccrine glands are located under the skin's surface and contain sebaceous material that is released when you exercise or become excited like people do when giving a speech or singing. This material is responsible for causing your skin to smell after it has been washed. Unlike other glands, apoeccrine glands cannot be felt under the skin.
When you feel anxious or afraid, your heart rate increases, blood flows to the muscles, and perspiration also increases. This is because you need more energy to deal with these emotions.
You can learn to control your sweating by focusing on your breathing.
There are two types of sweat glands in your skin: eccrine and apocrine. Eccrine glands are found throughout your body and open directly onto the skin's surface. Apocrine glands protrude from the hair follicle to the skin's surface. They can be found near the nose, on the chest, and between the legs, for example.
Eccrine glands produce clear, odorless sweat that keeps you cool by perspiring through your skin. This is the kind of sweat that you expect to lose when you exercise vigorously or in hot weather. The more active your lifestyle, the more often you need to drink water to stay healthy and hydrated.
Apocrine glands only release sweat with bacteria inside them. These glands are found mostly around the belly button and underarms. They produce an oily substance that helps prevent infection while they're dormant each day. When a nerve cell in this area of your body is activated, however, the gland begins to work its way toward the surface, where it can be felt through rough clothing. The released oil causes some people to smell like apricots or almonds even though they have no knowledge of chemistry.
As you can see, our bodies react naturally to heat by sweating. Without this protection, we would die after a few hours in the intense temperatures found in deserts or inside coal mines. However, sweating has some negative effects as well.
Eccrine sweat glands are simple, coiled, tubular glands that are found all over the body, most notably on the soles of the feet. Sweat glands, hair follicles, hair arrector muscles, and sebaceous glands are all found in the thin skin that covers the majority of the body. This protective layer called the epidermis develops constantly through repeated cycles of growth and death known as mitosis and apoptosis, respectively. The outermost layer of the epidermis is made up of flat, dead cells called keratinocytes. Under the influence of nerve signals transmitted through the sympathetic nervous system, these cells grow and divide to form a new layer every four to six days. As they divide, they also produce special proteins that cause them to die after they have done their job. These proteins control the amount of skin that gets renewed each month and allow people to avoid sunburn when they go out into the sunlight. People with more active lifestyles may need to replace their skin more frequently than others to keep up with their sports or work activities.
The inner core of the skin is made up of bundles of collagen and elastin fibers that provide support for the skin's surrounding tissues. Blood vessels, nerves, and lymphatic systems run along side these fibers toward the surface of the skin where they branch out into small tubes that lead to various parts of the body.