ADH Hormone Function and Pathway

Questions and Answers

What is the composition of antidiuretic hormone (ADH)?

A small peptide hormone made up of amino acids (correct)

A nucleic acid

A complex carbohydrate

A lipid molecule

What is the primary effect of ADH on blood vessels?

Increased blood flow and decreased pressure

Decreased blood flow and increased pressure

Vasoconstriction and increased resistance (correct)

Vasodilation and decreased resistance

What is the formula that relates to blood pressure?

Delta P = Q/R

Delta P = Q - R

Delta P = Q × R (correct)

Delta P = Q + R

What is the effect of increased resistance on blood pressure?

It increases blood pressure Signup and view all the answers

What is the other organ that ADH acts on besides blood vessels?

Kidney Signup and view all the answers

What is the net effect of ADH on blood pressure?

It increases blood pressure Signup and view all the answers

What is the term for the constriction of blood vessels?

Vasoconstriction Signup and view all the answers

What is the correct definition of flow (Q)?

Stroke volume times heart rate Signup and view all the answers

What is the primary function of ADH in the body?

To facilitate the transportation of water into the blood Signup and view all the answers

What happens to the aquaporin vesicle when ADH is present?

It merges with the wall of the collecting duct cell Signup and view all the answers

What is the result of ADH allowing water to enter the blood?

An increase in blood volume Signup and view all the answers

What is the term for the water-channel forming proteins?

Aquaporin Signup and view all the answers

What is the effect of ADH on the collecting duct cell?

It makes the cell more permeable to water Signup and view all the answers

What is the primary effect of increased reabsorption of water in the kidneys?

Increased arterial pressure Signup and view all the answers

What happens to the stroke volume of the heart as a result of ADH?

It increases Signup and view all the answers

Where does ADH have its effect in the nephron?

Collecting duct Signup and view all the answers

What is the ultimate result of ADH's effect on the blood?

An increase in blood pressure Signup and view all the answers

Where does ADH float through to have its effect?

Through the blood Signup and view all the answers

What is the concentration of the collecting duct in terms of milliOsms?

900 Signup and view all the answers

What is the function of aquaporin in the collecting duct cells?

To allow water to enter the cell Signup and view all the answers

Why is the saltiness of the collecting duct important?

It allows us to concentrate our urine Signup and view all the answers

What happens to water when it reaches the areas without aquaporin channels?

It bounces back and goes down into the urine Signup and view all the answers

What is the direction of urine flow in the collecting duct?

Downwards Signup and view all the answers

What is the effect of ADH on the collecting duct?

It increases water reabsorption Signup and view all the answers

What is the relationship between the concentration of the collecting duct and its location?

The concentration increases as you go deeper Signup and view all the answers

What is the main purpose of the nephron's structure?

To concentrate or dilute urine Signup and view all the answers

Study Notes

Antidiuretic Hormone (ADH)

ADH is a small peptide hormone made up of amino acids
It is secreted into the blood vessels of the posterior pituitary and travels to different parts of the body

Effects of ADH on Blood Pressure

ADH increases blood pressure by targeting smooth muscle in arterial vessels, causing vasoconstriction
Vasoconstriction increases resistance, which in turn increases blood pressure according to the formula: ΔP = Q × R (change in pressure equals flow rate times resistance)
Increased resistance and blood pressure are directly related

Effects of ADH on the Kidney

ADH acts on the kidney, specifically on the collecting duct cells, to increase reabsorption of water
This increases stroke volume, which in turn increases blood pressure
ADH affects the kidney by causing the insertion of aquaporin channels into the collecting duct cells, allowing water to flow from the urine into the blood

Mechanism of ADH in the Kidney

ADH causes aquaporin vesicles to merge with the cell wall, creating channels for water to flow across
Water then flows from the urine into the bloodstream, increasing blood volume and subsequently stroke volume
The increase in stroke volume leads to an increase in blood pressure

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Description

This quiz is about the journey of Antidiuretic Hormone (ADH) after its secretion into the blood vessels of the posterior pituitary. It covers the path ADH takes through the body and its functions.