17 Questions
Why do the life spans of crows and parrots show a wide difference despite their similar sizes?
Genetic variations
What is true about the life span of a mango tree compared to a peepal tree?
Peepal trees live longer than mango trees
Why is it said that there is no natural death in single-celled organisms?
They have unlimited reproductive capacity
What ensures the continuity of vast numbers of plant and animal species on earth for several thousands of years?
Reproductive processes
What does the life span of an organism signify?
The entire duration from birth to natural death
Which segment of the nephron is responsible for reabsorbing nearly all essential nutrients and 70-80% of electrolytes and water?
Proximal Convoluted Tubule (PCT)
What is the function of the descending limb of the Loop of Henle?
Concentration of the filtrate
In which segment of the nephron does conditional reabsorption of Na+ and water take place?
Distal Convoluted Tubule (DCT)
Which part of the nephron helps to maintain the pH and ionic balance of body fluids by selective secretion of hydrogen ions and ammonia into the filtrate?
Proximal Convoluted Tubule (PCT)
What is the role of the ascending limb of the Loop of Henle?
Decereased Concentration of the filtrate
Which segment of the nephron is capable of reabsorption of HCO3– and selective secretion of hydrogen and potassium ions and NH3 to maintain pH and sodium-potassium balance in blood?
Distal Convoluted Tubule (DCT)
What is the primary function of the descending limb of the Loop of Henle?
Maintenance of high osmolarity of medullary interstitial fluid
In which segment of the nephron does selective secretion of hydrogen ions and ammonia into the filtrate take place?
Proximal Convoluted Tubule (PCT)
Which part of the nephron is responsible for maintaining the pH and sodium-potassium balance in blood by selective secretion of potassium ions and NH3?
Distal Convoluted Tubule (DCT)
Which segment of the nephron is responsible for reabsorbing nearly all essential nutrients and 70-80% of electrolytes and water?
Proximal Convoluted Tubule (PCT)
What role does the ascending limb of the Loop of Henle play in the nephron?
Transport of electrolytes actively or passively
What is the main function of the Proximal Convoluted Tubule (PCT) in the nephron?
Reabsorption of essential nutrients and electrolytes
Study Notes
Life Span and Species Continuity
- The life span of crows and parrots differ significantly despite their similar sizes.
- The life span of a mango tree is shorter compared to a peepal tree.
- Single-celled organisms do not experience natural death.
- The continuity of vast numbers of plant and animal species on earth for several thousand years is ensured by various mechanisms.
- The life span of an organism signifies its survival and reproductive duration.
Nephron Function and Structure
Proximal Convoluted Tubule (PCT)
- The PCT is responsible for reabsorbing nearly all essential nutrients and 70-80% of electrolytes and water.
Loop of Henle
- The descending limb of the Loop of Henle has a primary function of reabsorbing water and electrolytes.
- The ascending limb of the Loop of Henle plays a role in maintaining the concentration of the filtrate.
- Conditional reabsorption of Na+ and water takes place in the ascending limb of the Loop of Henle.
Nephron Segments
- The segment responsible for maintaining the pH and ionic balance of body fluids by selective secretion of hydrogen ions and ammonia into the filtrate is the Distal Convoluted Tubule (DCT).
- The segment capable of reabsorption of HCO3– and selective secretion of hydrogen and potassium ions and NH3 to maintain pH and sodium-potassium balance in blood is the Distal Convoluted Tubule (DCT).
- The segment responsible for reabsorbing nearly all essential nutrients and 70-80% of electrolytes and water is the Proximal Convoluted Tubule (PCT).
Test your knowledge on life spans of various organisms based on the information provided in Figure 1.1. Examine the life spans of depicted organisms and determine their life spans.
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