Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Quizzes

Create quizzes and tests automatically from your content using AI.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing

Search...

10 Questions

0 Views

Calcium's Role in Light Adaptation

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which of the following is a factor that contributes to the eye's ability to adapt to changes in light level?

Changes in calcium concentration within the cones (correct)

Changes in potassium concentration within the cones

Changes in sodium concentration within the cones

Changes in chloride concentration within the cones

What happens to the cones when you step out into bright light from a dark theater?

They become inhibited

They become excited

They become hyperpolarized (correct)

They become depolarized

What is the inhibitory effect of calcium on the enzyme that synthesizes cGMP?

It stops the synthesis of cGMP

It decreases the synthesis of cGMP (correct)

It has no effect on the synthesis of cGMP

It increases the synthesis of cGMP

What would happen if the cones stayed in a hyperpolarized state?

We would be unable to see further changes in light level Signup and view all the answers

What is the equilibrium potential for K?

EK Signup and view all the answers

What is the role of the constriction of the pupil in light adaptation?

It helps in reducing the light entering the eye Signup and view all the answers

What initiates a process that gradually reopens the cGMP-gated channels even if the light level does not change?

The closure of the channels Signup and view all the answers

How does calcium affect photopigments and phosphodiesterase?

It decreases their response to light Signup and view all the answers

What do calcium-based mechanisms ensure in the photoreceptors?

They ensure the ability to register relative changes in light level Signup and view all the answers

What is the role of calcium in light adaptation?

Calcium concentration changes within the cones Signup and view all the answers