Homeostatic Control of the Internal Environment (Grade 12 NSC Matric Life Sciences): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the internal environment of the body?
What is the internal environment of the body?
Tissue fluid surrounding all cells
Which six factors does the body maintain through homeostasis?
Which six factors does the body maintain through homeostasis?
Water, salt, glucose, CO₂, thyroxin, temp
Why must the lungs carefully regulate CO₂ levels?
Why must the lungs carefully regulate CO₂ levels?
CO₂ affects pH; enzymes sensitive to pH
What happens to enzymes if body temperature gets too high?
What happens to enzymes if body temperature gets too high?
Enzymes become denatured (damaged)
Which organs work together to regulate glucose levels?
Which organs work together to regulate glucose levels?
Liver and pancreas
How do dissolved salts in blood affect cells?
How do dissolved salts in blood affect cells?
Control osmotic pressure & water movement
When water levels decrease, what does the pituitary gland do?
When water levels decrease, what does the pituitary gland do?
Secretes more ADH
What happens when water levels in blood increase?
What happens when water levels in blood increase?
Less ADH; less water reabsorbed
What is the role of ADH in the kidneys?
What is the role of ADH in the kidneys?
Controls water reabsorption
What is negative feedback in homeostasis?
What is negative feedback in homeostasis?
Response opposes the original change