Human Biology 3A Notes CHAPTER 4: Chemical Messengers Homeostasis: the maintenance of a constant internal environment Homeostasis ensures that the fluid environment of the cells: • Contains the optimum concentration of nutrients‚ ions‚ gases and water • Stays at a constant temperature – the optimum temperature for normal cell functioning • Is maintained at the optimum pressure Feedback system: Negative feedback system: Negative feedback: Positive feedback: A situation where the response toa
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The people’s car – generically‚ Volkswagen in German – is almost as old as the automobile‚ and the type was familiar in Germany long before the advent of the Volkswagen. Usually these “popular” cars were minimal cars‚ though size and simplicity did not necessarily bring them within the reach of the ordinary man in the street. Henry Ford did build a successful universal car‚ to sell at a low price‚ but his Model T with its 2.9-litre engine was by no means a small
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Types of Sports Cars Many people have a great fascination for sports cars. These machines have a lot of power and torque‚ and most importantly are lower to the ground‚ contributing to proper aerodynamics against the wind. Moreover‚ they are generally available in either two-wheel drive or four-wheel drive. Two-wheel drive ones are usually used for road racing or drifting‚ whereas AWD sports cars are used for rally racing. Just like any other cars‚ they are also divided into certain groups.
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PRINCIPAL STRUCTURAL UNITS OF THE AIRPLANE Dialogue T. We’ll consider the principal structural units of the airplane. Look at the picture (Fig. 1.1). This is an airplane. [pic] Figure 1.1 T. Do you know the meaning of the word ’airplane’ ? S. Yes‚ I do. It is ’літак’. T. You are right. There are some words in the English language which have the
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caused due to poor quality and badly maintained roads. The constant movement of the overweight vehicles like trucks is also responsible for these ill roads. This ill quality roads will cause severe damage to the vehicles in terms of tyres and the shock absorbers and most important thing is the accidents which is caused due to this. A system called Pothole Detection System which detects holes on roads or uneven roads. So that it helps in maintain the roads in a good condition. Here two sensors accelerometer
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Tata’s Nano: A Small Car with Large Consumer Surplus? Ref. No.: ME0012 op y Tata’s Nano: A Small Car with Large Consumer Surplus? “Since‚ promise is a promise the standard dealer version will cost Rs 1 lakh‚”1 – Ratan Tata‚ Chairman‚ Tata Sons “We designed the Nano to offer a new form of transport to the people of India and maybe later‚ to the rest of the world.”2 – Ratan Tata‚ Chairman‚ Tata Sons “…if economists are to play their part in shaping the canons of economic policy
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CENTRAL NERVOUS SYSTEM The Brain -recap * The brain receives signals from inside and outside the body. * It keeps the basic‚ body functions such as heart beat rate‚ breathing rate and temperature control ticking over‚ without us having to think about it. * It also allows us to decide to do things like running and walking and many more complex tasks. It is where our personalities and moods and emotions come from. * The brain of a human being makes up about one-fiftieth of
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Hippocampus Responsible for the storage of short and long term memories. Also responsible for the forming of new memories and connecting emotions and sensations to them. Part of the limbic system. Absorber Absorber has the ability to remember what most people could never remember. Anything he has ever experienced‚ can be remembered in great detail. Amygdala An almond shaped mass of nuclei located deep within the temporal
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I. Pascal’s Principle: ✓ The pressure applied on one part of container with fluid is transmitted equally in all directions. ✓ Pressure on one side is equal to the pressure on the other side of hydraulic press and lift Pascal Law: “The pressure exerted anywhere in a mass of confined liquid is transmitted undiminished in all directions throughout the liquid.” Equation for Pascal’s Principle: P1 = P2 F1 = F2 A1 A2 Problems: 1. The large piston in a hydraulic
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Joints and Body Movements Laszlo Vass‚ Ed.D. Version 42-0014-00-01 Purpose: What is the purpose of this exercise? In this exercise I will exam how joints function and thereby discover how they allow for movement in the body. Joints are where two bones come together. The joints hold the bones together and allow for movement of the skeleton. All of the bones‚ except the hyoid bone in the neck‚ form a joint. Joints
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