Active transport occurs in the secretion of substances into the nephron, the active transport of nutrients back into the and the selective reabsorption of salts required by the body. explain how the processes of filtration and reabsorption in the mammalian nephron regulate body composition Main Function: the kidneys of mammals regulate the internal water and salt concentrations in the body and excrete urea, the nitrogenous waste produced by mammals. Deamination: Proteins are made up of amino acids. They are made used and broken down by cell metabolism. However the body cannot store excess amino acids so any excess becomes nitrogenous waste to be removed. Deamination: This is the process by which excess amino acids are broken down in the liver. This process involves removing the part containing nitrogen (the amino group, -NH ) to form urea. The remainder is converted to carbohydrate which may be stored (as glycogen) or used immediately. Urea is transported by the blood to the kidneys and excreted as urine. The kidneys make It is an organ of filtration, reabsorption and secretion. Kidney Structure The kidneys are a pair of bean shaped organs found on either side of the abdomen. Kidneys produce urine. The main components of the mammalian urinary system can be seen in diagram 3 below. It is composed of two kidneys, two ureters, a bladder and the urethra. leaves the kidneys via the ureters and is stored in a muscular bag, the bladder. The bladder expands as it fills with urine. At a certain this expansion stimulated nerve endings in the bladder which send a message to the brain. The brain sends a message to the sphincter muscles surrounding the base of the bladder which relaxes so urine can pass through the urethra out of the body.
Active transport occurs in the secretion of substances into the nephron, the active transport of nutrients back into the and the selective reabsorption of salts required by the body. explain how the processes of filtration and reabsorption in the mammalian nephron regulate body composition Main Function: the kidneys of mammals regulate the internal water and salt concentrations in the body and excrete urea, the nitrogenous waste produced by mammals. Deamination: Proteins are made up of amino acids. They are made used and broken down by cell metabolism. However the body cannot store excess amino acids so any excess becomes nitrogenous waste to be removed. Deamination: This is the process by which excess amino acids are broken down in the liver. This process involves removing the part containing nitrogen (the amino group, -NH ) to form urea. The remainder is converted to carbohydrate which may be stored (as glycogen) or used immediately. Urea is transported by the blood to the kidneys and excreted as urine. The kidneys make It is an organ of filtration, reabsorption and secretion. Kidney Structure The kidneys are a pair of bean shaped organs found on either side of the abdomen. Kidneys produce urine. The main components of the mammalian urinary system can be seen in diagram 3 below. It is composed of two kidneys, two ureters, a bladder and the urethra. leaves the kidneys via the ureters and is stored in a muscular bag, the bladder. The bladder expands as it fills with urine. At a certain this expansion stimulated nerve endings in the bladder which send a message to the brain. The brain sends a message to the sphincter muscles surrounding the base of the bladder which relaxes so urine can pass through the urethra out of the body.
msb_part_3.docx