What are the components of the transport system in human beings? What are the functions of these components?
The main components of the transport system in human beings are blood or lymph, circulatory system and blood vessels. There are some main materials that needs to transport in our body like water, minerals, nutrients, gases, hormones, waste material and cells which protects our body for the diseases by the various systems.
Blood:- it is a mobile fluid, sticky and is basic (pH 7.4) and is of two types- oxygenated and deoxygenated. Blood is composed of four components- plasma, Red blood corpuscles, White blood corpuscles and Platelets. Plasma helps in the transportation of the food like glucose, certain amino acids, triglycerides, vitamins, minerals through the plasma from alimentary canal to the tissues for the growth and maintenance; helps in transportation of oxygen from lungs to the tissues for the breakdown of the food; transportation of carbon dioxide from the tissues to the lungs for the elimination from the body; transportation of hormones, wastes materials, metabolic processes products and also helps in the regulation of the hydrogen ion concentration, body temperature etc. Red blood cells help in the transport of oxygen and carbon dioxide by forming oxyhaemoglobin and carbaminohemoglobin respectively. White blood cells plays important role in the body defence against the microorganisms. And, platelets plays vital role in the blood clotting.
Circulatory system or heart:- function of the heart is to pump the oxygenated blood and the deoxygenated blood and some body fluids. Oxygenated blood is pumped throughout the body and takes deoxygenated blood from the various parts of the body to the lungs for the purification of blood from the impure blood.
Blood vessels:- blood vessels are elastic, muscular tubes and consists of Arteries and Veins. Arteries carry the blood from the heart to the various parts of the body through the blood vessels and the veins carry the blood from the various parts of the body to the heart through the blood vessels. And, they both arteries and veins joined together by capillaries. This process is completed by the blood vascular system and the lymphatic system.
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
How is the amount of urine produced regulated?
What criteria do we use to decide whether something is alive?
What are the different ways in which glucose is oxidised to provide energy in various organisms?
The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
(a) cytoplasm. (c) chloroplast.
(b) mitochondria. (d) nucleus.
What are the differences between autotrophic nutrition and heterotrophic nutrition?
What are outside raw materials used for by an organism?
What would be the consequences of a deficiency of haemoglobin in our bodies?
What are the components of the transport system in highly organised plants?
What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
What is a good source of energy?
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
What changes can you make in your habits to become more environment-friendly?
What is the difference between a reflex action and walking?
What is the importance of DNA copying in reproduction?
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Why should a magnesium ribbon be cleared before burning in air?
Define the principal focus of a concave mirror.
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.
Name a mirror that can give an erect and enlarged image of an object.
Name the type of mirror used in the following situations.
(a) Headlights of a car.
(b) Side/rear-view mirror of a vehicle.
(c) Solar furnace.
Support your answer with reason.
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
(a) Between the principal focus and the centre of curvature
(b) At the centre of curvature
(c) Beyond the centre of curvature
(d) Between the pole of the mirror and its principal focus.
What kind of mirror – concave, convex or plain – would be best suited for use in a solar cooker? Why?
An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.
The magnification produced by a plane mirror is +1. What does this mean?
Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?
Why does the cord of an electric heater not glow while the heating element does?
Judge the equivalent resistance when the following are connected in parallel – (a) 1 Ω and 106 Ω, (b) 1 Ω and 103 Ω, and 106 Ω.