Seminiferous tubules produce and transport sperm cells inside the testicles; these tiny tubes are full of Sertoli cells which help facilitate sperm cell growth. The process of sperm maturing in seminiferous tubules is called meiosis.
Mammals, birds and even some fish have seminiferous tubules in the male members of the species. Inside of a testicle, there are a number of different sections called lobules; the area that separates each lobule is called a septa. Each lobule has multiple internal seminiferous tubules. There are also Ledyig cells here that produce testosterone and other types of hormones to help with the sperm growth process. Tubules each have a straight part and one that is convoluted; this section twists in on itself in order to allow for more production within a smaller space. The straight section then transports the sperm created in the convoluted section out of the testicles where it can aid in reproduction. The tubules also have a design that prevents any larger material from entering due to the tight connections in the Sertoli cells. One of the reasons for this is that if the body’s immune system managed to travel into this part of the testicles, it could decide that sperm are a threat to the body and then destroy them.Learn More
The functions of the hypothalamus include the secretion of neurohormones, often termed as hypothalamic-releasing hormones, such as growth-releasing hormones and dopamine hormones. These hypothalamic-releasing hormones stimulate or inhibit the secretion of pituitary hormones.Full Answer >
Glomeruli are the components that carry out the primary filtering action of the kidney. They connect on one side to the blood vessels that enter the kidney, and on the other side to fluid-collecting structures called tubules. The glomeruli accept the blood from the arteries and pass the filtered wastes and any extra water present into the tubules, according to the National Institute of Diabetes and Digestive and Kidney Diseases.Full Answer >
The function of the pancreas is to help with digestion. It mainly does this by secreting insulin, which helps the cells in the body use glucose, which is their main fuel. The pancreas also secretes other digestive juices and enzymes. These digestive juices flow through ducts into the duodenum, which is the lower part of the stomach and the upper part of the small intestine.Full Answer >
The function of the iris is to control light levels in the eye. The round, black dot in the center of the iris is called the pupil.Full Answer >