Lecture 5: Glucose Homeostasis

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How does glucose enter the body?

Via specific glucose transporters (correct)

Through diffusion alone

Through direct absorption in the bloodstream

By active transport mechanisms

What role do GLUT transporters play in glucose transport?

Promoting glucose release from cells

Facilitating glucose entry into cells (correct)

Inducing blood glucose fluctuations

Preventing glucose diffusion

Which mechanism provides better control over glucose levels according to the text?

Storage and release mechanisms (correct)

Active glucose transport

Glucose diffusion

Glucose transport via GLUT4

What is the target organ of insulin for promoting glycogen storage?

Liver Signup and view all the answers

During fasting, what is the primary target of glucagon?

Liver Signup and view all the answers

What is the main source of energy for the brain?

Glucose Signup and view all the answers

In terms of energy utilization, why are glycogen stores in the brain considered low?

Glycogen is not a preferred energy source for the brain Signup and view all the answers

Which of the following can be used as an alternative fuel source to glucose?

Ketones Signup and view all the answers

Why is it important to maintain blood sugar levels in the body?

To supply energy to the brain Signup and view all the answers

What is a key aim of the presentation regarding glucose homeostasis?

To describe mechanisms for maintaining blood sugar in different states Signup and view all the answers

Why are ketones mentioned in relation to energy sources for the brain?

As an alternative to glucose when glycogen is low Signup and view all the answers

What is the primary function of GLUT transporters in glucose transport?

Facilitating the entry of glucose into cells Signup and view all the answers

Which mechanism is mentioned as dampening changes in blood glucose levels through diffusion across tissues?

Glucose diffusion Signup and view all the answers

What is the role of insulin in terms of promoting glucose uptake in muscles?

Facilitating glucose storage in muscle cells Signup and view all the answers

Why is it stated that glucose cannot cross membranes directly and requires glucose transporters?

To facilitate glucose movement into cells Signup and view all the answers

Which of the following substances is NOT mentioned as a target for insulin action?

Brain cells Signup and view all the answers

In terms of blood sugar control, what is a key function of glucagon?

Stimulating glycogen breakdown in the liver Signup and view all the answers

What is the main function of feedback loops as described in the presentation?

To maintain stability in blood sugar levels Signup and view all the answers

Why is glucose highlighted as the main energy source for the brain in the presentation?

Because it is the most efficient fuel for the brain Signup and view all the answers

In what state does the presentation suggest that ketones can be used as an energy source?

In a fasting state Signup and view all the answers

Which of the following statements accurately describes circulating glucose according to the presentation?

Glucose is the primary energy source for the brain Signup and view all the answers

How are feedback loops related to blood sugar maintenance?

By regulating glucose levels continuously Signup and view all the answers

What is the significance of maintaining blood sugar levels, as highlighted in the presentation?

To ensure proper brain function Signup and view all the answers