Insect Excretory System Overview

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What is the main function of contractile vacuoles in protists?

To regulate the internal water balance of the cell (correct)

To produce energy for the cell

To break down waste products in the cell

To store food for the cell

How do amoebas use contractile vacuoles to expel waste and excess water?

They use cilia to push the water out of the cell

They convert the excess water into a solid waste product that is excreted

They have specialized pores that allow the water to passively diffuse out

They merge the contractile vacuole with the cell membrane to release the water (correct)

Why do most multicellular organisms lack contractile vacuoles?

Multicellular organisms have more complex osmoregulatory mechanisms (correct)

Contractile vacuoles are only found in unicellular organisms

Contractile vacuoles are too inefficient for larger organisms

Multicellular organisms have no need to regulate water balance

How do the contractile vacuoles in paramecium differ from those in amoeba?

Paramecium has a more complex system with canals feeding water into the vacuole before expulsion Signup and view all the answers

Which of the following is true about the role of contractile vacuoles in fungi?

Fungi possess contractile vacuoles in their unicellular stage but not in the multicellular stage Signup and view all the answers

What is the primary purpose of the protonephridia system in planaria (flatworms)?

To remove metabolic waste and regulate water balance Signup and view all the answers

Which process is primarily responsible for moving Na+ and K+ into the lumen of Malpighian tubules?

Active transport Signup and view all the answers

What is the primary role of the Malpighian tubules in insect osmoregulation?

Excretion of metabolic wastes Signup and view all the answers

How is water moved into the lumen of the Malpighian tubules?

By osmosis Signup and view all the answers

What is the advantage of excreting uric acid instead of other nitrogenous wastes?

Uric acid conserves water Signup and view all the answers

What is the main difference between osmoconformers and osmoregulators?

Osmoregulators actively control their internal environment while osmoconformers do not Signup and view all the answers

Which process is responsible for reabsorbing essential ions from the Malpighian tubule fluid back into the hemolymph?

Active transport Signup and view all the answers

Which of the following processes occurs in the proximal tubule?

Reabsorption of bicarbonate ions Signup and view all the answers

What is the primary function of aquaporins in the descending loop of Henle?

Facilitate water reabsorption into the interstitial fluid Signup and view all the answers

For water to move out of the descending loop of Henle by osmosis, what condition must be met?

The interstitial fluid must have a higher solute concentration than the tubule Signup and view all the answers

Which of the following substances are actively transported from the peritubular capillaries into the proximal tubule?

Toxins and drug molecules Signup and view all the answers

What is the primary mechanism by which water is reabsorbed from the proximal tubule?

Bulk transport Signup and view all the answers

Which of the following statements is true about the processes in the proximal tubule and descending loop of Henle?

The proximal tubule reabsorbs ions, while the descending loop reabsorbs water Signup and view all the answers