EXCRETION- THE KIDNEYS

Question 1

THE KIDNEYS ARE (…) ORGANS

Answer 1

EXCRETION

Question 2

THE KIDNEYS ARE PART OF THE URINARY SYSTEM AND PERFORM THREE MAIN ROLES…

Answer 2

1) REMOVAL OF UREA FROM THE BLOOD
2) ADJUSTMENT OF IRON (SALT) LEVELS IN THE BLOOD
3) ADJUSTMENT OF WATER CONTENT OF THE BLOOD

Question 3

(…) ARE THE FILTRATION UNITS IN THE KIDNEYS

Answer 3

NEPHRONS

Question 4

ULTRAFILTRATION PMROCESS

Answer 4

1) BLOOD FROM THE RENAL ARTERY FLOWS THROUGH THE GLOMERULUS
2) A HIGH PRESSURE IS BUILT UP WHICH SQUEEZES WATER, UREA, IONS AND GLUCOSE OUT OF THE BLOOD AND INTO THE BOWMAN’S CAPSULE
3) THE MEMBRANES BETWEEN THE BLOOD VESSELS IN THE GLOMERULUS AND THE BOWMAN’S CAPSULE ACT LIKE FILTERS
4) BIG MOLECULES LIKE PROTEINS AND BLOOD CELLS ARE NOT SQUEEZED OUT

Question 5

EACNH KIDNEYT CONTAINS THOUSANDS OF NEPHRONS, HERS WHAT HAPPENS AS THE BLOOD PASSES THROUGH THEM

Answer 5

1) ULTRAFILTRATION
2) REABSORPTION

Question 6

REABSORPTION PROCESS

Answer 6

1) AS THE FILTRATE FLOWS ALONG THE NEPHRON, USEFUL SUBSTANCES ARE SELECTIVELY REABSORBED BACK INTO BLOOD
2) ALL THE GLUCOSE IS REABSORBED FROM THE PROXIMAL CONVOLUTED TUBULE SO THAT IT CAN BE USED IN RESPIRATION
3) SUFFICIENT IONS ARE REABSORBED
4) SUFFICIENT WATER IS REABSORBED FROM THE COLLECTING DUCT INTO THE BLOODSTREAM BY OSMOSIS