Science Single Award - 4SS0 PearsonEdexcel

Transport

Bayani Gaba-gaba

A single-celled organism can swap gases with its surroundings directly through its membrane, but a human body has trillions of cells, many of them buried deep inside. Without a transport system to carry oxygen, nutrients, and waste, those inner cells would die within minutes.

In this lesson you will explore the composition of blood and the roles of its components, the structure and function of the heart and blood vessels, and how the double circulatory system keeps the body supplied. These are some of the most heavily examined topics on Paper 1.

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 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, including shape, the absence of a nucleus and the presence of haemoglobin
Understand how the immune system responds to disease using white blood cells, illustrated by phagocytes ingesting pathogens and lymphocytes releasing antibodies specific to the pathogen
Describe the structure of the heart and how it functions
Understand how the structure of arteries, veins and capillaries relates to their function
Understand the general structure of the circulation system, including the blood vessels to and from the heart and the lungs

Takardar Darasi

Unicellular organisms such as Amoeba have a large surface area relative to their volume. Substances can reach every part of the cell quickly by diffusion alone, so they do not need a transport system.

Akwai a cikin manhajar Green Bridge

Zazzage manhajar Green Bridge CBT a wayar ka ko kwamfyuta ka don samun cikakkiyar bayanan darasi, tambayoyin aiki, da ƙari.

Cikakkiyar bayanan darasi tare da zane-zane

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Yi karatu ba tare da intanet ba, a kowane lokaci, a ko'ina

Zazzage manhajar wayar hannu Zazzage manhajar kwamfyuta

Akwai a Android, Windows, macOS, da Linux

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 transports oxygen? A) Plasma B) White blood cells C) Red blood cells D) Platelets Answer: C
The pulmonary artery carries: A) Oxygenated blood to the lungs B) Deoxygenated blood to the lungs C) Oxygenated blood to the body D) Deoxygenated blood to the body Answer: B
Which blood vessel has valves to prevent backflow? A) Artery B) Capillary C) Vein D) Aorta Answer: C
Why do multicellular organisms need a transport system? A) Their cells are too large for diffusion B) Their SA:V ratio is too small for diffusion alone C) They do not have cell membranes D) They cannot respire without one Answer: B
Antibodies are produced by: A) Red blood cells B) Platelets C) Phagocytes D) Lymphocytes Answer: D