National 5 Biology Unit 2: Multicellular Organisms

False (B)

Insulin and glucagon

<p>receptors</p> Signup and view all the answers

<p>Insulin = Lowers blood sugar Glucagon = Increases blood sugar</p> Signup and view all the answers

<p>To act as chemical messengers (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Glycogen is a carbohydrate made of glucose, primarily stored in the liver.</p> Signup and view all the answers

<p>endocrine glands</p> Signup and view all the answers

<p>To absorb nutrients into the blood (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Left atrium</p> Signup and view all the answers

<p>villi</p> Signup and view all the answers

<p>Arteries = Carry blood away from the heart Veins = Carry blood towards the heart Capillaries = Exchange substances with tissues Pulmonary arteries = Carry deoxygenated blood to the lungs</p> Signup and view all the answers

<p>Fatty acids (B)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>Thin walls</p> Signup and view all the answers

<p>To facilitate the exchange of materials at the cellular level (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>A good blood supply and a large surface area.</p> Signup and view all the answers

<p>capillaries</p> Signup and view all the answers

<p>Capillaries = To provide a large surface area for absorption Alveoli = To facilitate gas exchange Villi = To absorb nutrients from food Thin walls = To speed up absorption</p> Signup and view all the answers

<p>Carbon dioxide (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>They facilitate gas exchange.</p> Signup and view all the answers

<p>blood supply, large surface area, thin walls</p> Signup and view all the answers

Cells that detect a stimulus and convert it into an electrical impulse.

Parts of the body (muscles or glands) that respond to the signal from the brain or nervous system.

Chemical messengers that travel in the bloodstream to target tissues.

Organs that produce hormones.

A tissue with receptor proteins for a specific hormone.

Hormone that lowers blood sugar.

Hormone that increases blood sugar.

Type of sugar easily transported in the blood.

Good surfaces for absorption have a strong blood supply to remove absorbed materials, a large surface area to absorb more materials, and thin walls to speed up absorption.

Networks of tiny blood vessels that allow the exchange of materials between cells and the bloodstream.

Tiny air sacs in the lungs. They have a large surface area for gas exchange.

Oxygen moves from the alveoli into the blood, while carbon dioxide moves from the blood into the alveoli.

Tiny, finger-like projections in the small intestine that increase its surface area.

Nutrients, like glucose and amino acids, are absorbed into the bloodstream through the villi in the small intestine.

Villi increase surface area to absorb nutrients (glucose and amino acids) more efficiently.

Waste products like carbon dioxide are removed from cells into the bloodstream.

A lymphatic vessel located within each villus, responsible for absorbing fatty acids and glycerol.

Finger-like projections in the small intestine that increase the surface area for absorption of nutrients.

Capillaries absorb water-soluble nutrients like sugars and amino acids.

Lacteals absorb fat-soluble nutrients like fatty acids and glycerol.

Villi increase the surface area of the small intestine, allowing for more efficient absorption of nutrients.

Villi are thin-walled and have a good supply of blood vessels and lacteals, making them efficient at absorbing nutrients.

Villi increase surface area for nutrient absorption, while capillaries provide a good blood supply to transport those absorbed nutrients throughout the body.