(8) Homeostasis and excretion Flashcards
What is homeostasis?
It is how the body’s internal conditions are kept constant.
What is tissue fluid?
It is a watery solution of salts, glucose and other solutes. It surrounds all cells, forming a pathway to transfer nutrients.
Why is homeostasis important?
Because cells will only function properly if they are bathed in a tissue fluid that can provide them with optimum conditions.
What are two examples of nitrogenous waste?
- Urea
- Ammonia
What arteries supply blood to and from the kidneys?
The renal artery and the renal vein.
Where is urine stored in?
The bladder
What is the darker outer region of the kidney called?
The cortex, this is also where the nephrons are located.
What is the middle layer of the kidney called?
The medulla
What are pyramids?
They are bulges in the medulla, and they empty urine into a funnel like structure called the pelvis.
What is a bowman’s capsule?
It is a cup of cells that is at the start of a nephron.
What is a glomerulus?
It is a ball of capillaries that is inside of the capsule.
What are the names of the arterioles that supply blood to and from the glomerulus?
The afferent arteriole supplies blood to the glomerulus and the efferent arteriole supplies blood away from the glomerulus.
What is the membrane between the glomerulus and the bowman’s capsule?
It is the basement membrane.
What does the loop of henle do?
It is involved with concentrating the fluid in the tubule by reabsorbing more water into the blood.
What does ADH do?
It is a hormone that controls the concentration of urine.
