Science Double Award - 4SD0 PearsonEdexcel

Transport

Bayani Gaba-gaba

Every cell in your body needs a constant supply of oxygen, glucose and other nutrients, yet most of those cells are far too deep inside your tissues to receive anything by simple diffusion. Transport systems solve this problem: in plants, xylem and phloem carry water, minerals and sugars between roots and leaves; in humans, the heart drives blood through a double circulatory system that delivers materials to every tissue and removes waste.

This topic covers why multicellular organisms need dedicated transport networks, how plant vascular tissues work, what blood is made of and how each component does its job, the structure and function of the heart and blood vessels, and the risk factors that can compromise your circulation.

Manufura

Understand why simple, unicellular organisms can rely on diffusion for movement of substances in and out of the cell
Understand the need for a transport system in multicellular organisms
Describe the role of phloem in transporting sucrose and amino acids between the leaves and other parts of the plant
Describe the role of xylem in transporting water and mineral ions from the roots to other parts of the plant
Describe the composition of the blood: red blood cells, white blood cells, platelets and plasma
Understand the role of plasma in the transport of carbon dioxide, digested food, urea, hormones and heat energy
Understand how adaptations of red blood cells make them suitable for the transport of oxygen
Understand how the immune system responds to disease using white blood cells
Describe the structure of the heart and how it functions
Explain how the heart rate changes during exercise and under the influence of adrenaline
Understand how specific factors may increase the risk of developing coronary heart disease
Understand how the structure of arteries, veins and capillaries relates to their function
Understand the general structure of the circulation system

Takardar Darasi

A single-celled organism like an amoeba can rely on diffusion alone. Its surface area is large compared to its volume, and the distance from the membrane to the centre of the cell is tiny. But as organisms grow and become multicellular, that ratio shrinks. The distances become too great and the demand too high for diffusion to supply every cell. That is why multicellular organisms need specialised transport systems.

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Nazarin Darasi

Barka da kammala darasi akan Transport. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.

Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.

Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.

Which component of blood is responsible for transporting oxygen? A) Plasma B) White blood cells C) Red blood cells D) Platelets Answer: C
Phloem in plants transports: A) Water and mineral ions B) Sucrose and amino acids C) Oxygen and carbon dioxide D) Water and sucrose Answer: B
Which chamber of the heart has the thickest muscular wall? A) Right atrium B) Left atrium C) Right ventricle D) Left ventricle Answer: D
What is the function of valves in veins? A) To speed up blood flow B) To prevent the backflow of blood C) To filter waste from the blood D) To increase blood pressure Answer: B
Why can unicellular organisms rely on diffusion alone for transport? A) They have transport proteins B) They have a large surface area to volume ratio C) They have a circulatory system D) They are always in water Answer: B