Excretory System SAQs.docx
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The Excretory System SAQs - What is homeostasis? 1. the maintenance of a constant internal environment in the body. - What is excretion? 1. the removal of metabolic waste from the body. - What is secretion? 1. **Secretion** is the production and release of chemicals from cells. -...
The Excretory System SAQs - What is homeostasis? 1. the maintenance of a constant internal environment in the body. - What is excretion? 1. the removal of metabolic waste from the body. - What is secretion? 1. **Secretion** is the production and release of chemicals from cells. - The pituitary gland is responsible for secreting what hormone that controls how much water is reabsorbed? 1. ADH/ antidiuretic hormone - What is the role of excretion in homeostasis? 1. The excretory system **prevents the accumulation of poisonous wastes** that may interfere with metabolism. - What is osmoregulation? 1. controlling the balance of water and salts (potassium etc.) in the blood. - What is the function of the renal artery? 1. to carry blood that is high in waste products from the aorta to each kidney. - What are the 3 functions of the kidneys? 1. to filter the blood, control osmoregulation and reabsorption - What is the function of the bladder? 1. to store urine - What is the function of the urethra? 1. to carry urine out of the body - In which part of the kidney are nephrons mainly located? 1. the cortex - What is the function of the nephron? 1. to make urine. - Name the 3 stages that occur during urine production. 1. filtration, reabsorption, collection/ excretion. - What substances do not enter the bowman's capsule during filtration? 1. proteins and blood cells - Which part of the brain detects salt in blood concentration? 1. the hypothalamus - Which part of the brain secretes ADH? 1. The pituitary gland. - How is the production of ADH affected when the blood has a high salt concentration? Mention urine volume in your answer. 1. ADH is secreted from the pituitary gland and there is a low volume of urine produced. - How is ADH production affected when the blood has a low salt concentration? Mention urine volume in your answer. 1. The hypothalamus in the brain detects the diluted blood and turns off ADH production. There is a high volume of urine produced. - What is kidney failure and how is it treated? 1. Kidney failure happens when the kidney is no longer functioning properly. It is treated with dialysis or a kidney transplant.