The Kidneys And The Excretory System - Part 1 (T2) Flashcards Preview

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Describe excretion...

- excretion is the removal of toxic waste substance from the organism

- the waste products removed by excretion are those which are the result of metabolic reactions

1

What are the primary sites for excretion on a plant known as?

The stomata (singular: stoma)

2

Briefly describe homeostasis...

The process of keeping the conditions inside the human body relatively constant, despite the many changes that constantly occur inside and outside the body

3

The kidneys are one of the major organs which play a key role in homeostasis and excretion. Elaborate...

- the kidneys filter the blood

- remove any unwanted substances

- control the concentration of of water and solutes in the blood as well as in other body fluids

4

Along with the kidneys, what organs play main roles in the excretory systems and how?

- the lungs remove carbon dioxide

- the skin removes urea as part of sweat

5

Briefly breakdown the functions of of the kidneys in the urinary system...

- each kidney is supplied with oxygenated blood and nutrients via a renal artery

- the renal artery branches from the aorta, so blood enters the kidneys at high pressure

- the blood is filtered in each kidney before passing out via a renal vein to the inferior vena cava

- blood vessels take the blood through the kidneys where the waste products are removed into convoluted tubules

- these tubules join together to form the ureter

- urine then passes out of the ureter and into the bladder where it is stored

6

Describe how the bladder works in the urinary system...

- from the bladder is a tube which runs outside of the body called the urethra

- the walls of the urethra container two ring like muscles called sphincters

- these contract to close the urethra and hold back the urine

- the lower sphincter muscle is controlled consciously

- the upper sphincter muscle is involuntary and automatically relaxes when the bladder is full

7

What are the ureters?

Tubes leading from the kidneys to the bladder for urine to pass down

8

What is the urinary system designed to do?

The urinary system is designed to remove waste products like urea, as well as excess ions and water from our blood

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