Neurobiology and Insecticide Effects

The video explains how cockroaches, despite their resilience, are vulnerable to insecticides. It introduces Joey, a cockroach with an exoskeleton, and describes how insecticides penetrate this armor. The video details the normal function of neurons and how insecticides disrupt this process, leading to paralysis and death in cockroaches.

Why are cockroaches considered dangerous to live with?

• They are hard to catch.

• They eat human food.

• They can spread diseases.

• They are noisy.

What is Joey the cockroach's exoskeleton compared to?

• A shield

• A house

• A suit of armor

• A blanket

What allows insecticides to enter Joey's system?

• His mouth

• Small pores and spiracles

• His eyes

• His antennae

Which compounds in insecticides are lethal to Joey?

• Chlorine and Fluorine

• Sulfur and Nitrogen

• Carbon and Oxygen

• Pyrethrins and Pyrethroids

How do neurons normally transmit impulses in Joey's body?

• Through blood flow

• Through chemical reactions

• By muscle contractions

• Via axons and voltage-gated sodium channels

What role do voltage-gated sodium channels play in neuron function?

• They block impulses

• They store energy

• They allow sodium ions to enter and strengthen impulses

• They release hormones

What happens to the sodium channels when exposed to insecticides?

• They disappear

• They remain open

• They open and close rapidly

• They close permanently

What is the result of sodium channels remaining open due to insecticides?

• Faster movement

• Improved vision

• Paralysis

• Increased energy

What ultimately causes Joey's death after exposure to insecticides?

• Starvation

• Drowning

• Freezing

• Overheating

What is the main takeaway about how insecticides work on cockroaches?

• They have no effect

• They improve cockroach health

• They disrupt neuron function leading to paralysis

• They make cockroaches stronger