Hormones and Messenger Molecules Quiz

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Where are the extracellular domains of cell membrane receptors located?

Inside the cell

Exposed to the outside of the cell (correct)

Within the nucleus

Anchored in the lipid bilayer

Which type of receptor responds to hormone binding by activating second messengers?

Cell membrane receptors

Intracellular receptors (correct)

Enzyme linked receptors

G-protein coupled receptors

What is the function of enzyme linked receptors in response to an extracellular ligand?

Activate enzymatic activity (correct)

Activate ion channels

Inhibit enzyme function

Bind to G-proteins

Which type of receptor is associated with G-proteins and second messengers?

Cell membrane receptors Signup and view all the answers

Where do intracellular receptors respond to hormone binding?

Inside the cytoplasm Signup and view all the answers

Which receptor type is involved in responding to insulin and activating tyrosine kinase activity?

Enzyme linked receptors Signup and view all the answers

What is the primary function of hormones in the body?

To maintain a constant internal environment (homeostasis) Signup and view all the answers

Which of the following best describes the mechanism by which hormones can alter the activity of target cells?

By binding to specific hormone receptors on the target cell membrane Signup and view all the answers

In the negative feedback control loop for hormone secretion, what happens when the target tissue responds to the hormone?

The response reduces the original stimulus for hormone secretion Signup and view all the answers

Which of the following hormones is an example of a positive feedback loop?

Oxytocin during parturition (childbirth) Signup and view all the answers

In the context of hormone regulation, what is the difference between long and short feedback loops?

Long feedback loops regulate hormone secretion over a longer time period, while short feedback loops have a more rapid response Signup and view all the answers

Which of the following best describes the mechanism of insulin secretion from pancreatic beta-cells?

It is a short feedback loop that rapidly responds to changes in blood glucose levels Signup and view all the answers

What is the main function of the endocrine system?

Maintaining blood volume and pressure Signup and view all the answers

How do hormones affect target cells?

By binding to specific hormone receptors Signup and view all the answers

Which gland secretes melatonin and helps establish circadian rhythms?

Pineal gland Signup and view all the answers

What is the role of feedback control in hormone secretion?

Inhibits further secretion of hormones Signup and view all the answers

Which process helps the body maintain a constant internal environment?

Homeostasis Signup and view all the answers

In what way do hormones contribute to metabolic rate?

By affecting the activity of channel proteins and enzymes Signup and view all the answers