Cat Dissection Structures
Bio 142 Review Questions
Chapter 25, Urinary System
1. Know functions of urinary system. The Primary Functions of the Urinary System include: 1. Excretion – removal of organic wastes from body fluids 2. Elimination – discharge of waste products 3. Homeostatic regulation – of blood plasma volume and solute concentration
• Kidneys are major excretory organs o Like a city’s water treatment plant! • Urinary bladder is the temporary storage reservoir for urine • Ureters transport urine from the kidneys to the bladder • Urethra transports urine out of the body
• How does the urinary system control pH? o Regulation of plasma hydrogen ion concentration (pH). The kidneys partner up with the lungs and they together control the pH. The kidneys have a major role because they control the amount of bicarbonate excreted or held onto. The kidneys help maintain the blood Ph mainly by excreting hydrogen ions and reabsorbing bicarbonate ions as needed.
• Blood pressure? o The urinary system plays a role in maintaining normal blood pressure by secreting the enzyme renin.
One of the important functions of the kidneys is to regulate blood pressure.
Healthy kidneys make hormones such as renin and angiotensin. These hormones regulate how much sodium (salt) and fluid the body keeps, and how well the blood vessels can expand and contract. This, in turn, helps control blood pressure.
They do this by regulating: • The amount of water in the body. If there is too much water in the body (fluid overload) blood pressure will go up. If there is too little water in the body (dehydration) the blood pressure will drop. • The width of the arteries. The arteries constantly change in width as blood flows through them. The narrower the arteries, the higher the blood pressure. Renin helps control narrowing of the arteries.
Chapter 25, Urinary System
1. Know functions of urinary system. The Primary Functions of the Urinary System include: 1. Excretion – removal of organic wastes from body fluids 2. Elimination – discharge of waste products 3. Homeostatic regulation – of blood plasma volume and solute concentration
• Kidneys are major excretory organs o Like a city’s water treatment plant! • Urinary bladder is the temporary storage reservoir for urine • Ureters transport urine from the kidneys to the bladder • Urethra transports urine out of the body
• How does the urinary system control pH? o Regulation of plasma hydrogen ion concentration (pH). The kidneys partner up with the lungs and they together control the pH. The kidneys have a major role because they control the amount of bicarbonate excreted or held onto. The kidneys help maintain the blood Ph mainly by excreting hydrogen ions and reabsorbing bicarbonate ions as needed.
• Blood pressure? o The urinary system plays a role in maintaining normal blood pressure by secreting the enzyme renin.
One of the important functions of the kidneys is to regulate blood pressure.
Healthy kidneys make hormones such as renin and angiotensin. These hormones regulate how much sodium (salt) and fluid the body keeps, and how well the blood vessels can expand and contract. This, in turn, helps control blood pressure.
They do this by regulating: • The amount of water in the body. If there is too much water in the body (fluid overload) blood pressure will go up. If there is too little water in the body (dehydration) the blood pressure will drop. • The width of the arteries. The arteries constantly change in width as blood flows through them. The narrower the arteries, the higher the blood pressure. Renin helps control narrowing of the arteries.