ARTERIES? Veins need valves to create pressure to pump the blood to the heart. Blood flows away from the heart and‚ therefore‚ the pressure is not required. Helps against gravity. 6 NAME TWO EVENTS OCCURING WITHIN THE BODY THAT AID IN VENOUS RETURN. 1. Respiratory "Pump". Pressure changes that occur in the thorax during breathing. 2. Muscular "Pump". Contraction and Relaxation of skeletal muscles surrounding the veins 7 WHY ARE THE WALLS OF ARTERIES PROPERTIONATELY THICKER THAN THOSE OF THE CORRESPONDING
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Over 9‚097‚000 live tutoring sessions served! Sales Toll Free No: 1-866-617-6020 Home How it works About Us Top of Form Bottom of Form Home BiologyNervous Coordination and Integration in Animals Top Mechanism of Vision The eye works on the same principle as that of the camera. The light rays from the object pass through the conjuctiva‚ cornea‚ aqueous humour‚ lens and vitreous humour in that order. All these structures refract the light such that it falls on the retina. This
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TRANSPORT IN MAMMALS Blood is a connective tissue and every connective tissue consists of cell‚ ground substance or matrix and fibres. For blood‚ it has cells‚ matrix in the form of plasma and fibres in the form of fibrin. In transportation‚ the surface area to the volume ratio of organisms contributes to the rate of movement of materials. For example in Hydra‚ and flat worms‚ the ratio is so high so simple diffusion can allow substances to reach all tissues easily. If the ratio is low‚ in mechanisms
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use to strengthen your writing and reading skills (refer to your Student Resources Worksheet)? I think i would use the student library for the reading skills. but i think the one that would come in the most handy would be the student workshops‚ it extra practice the university provides‚ so that you can better understand the subject. or learn how to write better. What is your personal learning style (refer to the Ch. 1 Aplia homework)? I have an Aural learning style. it says “my preferred learning style
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Name: ______________________________ Types of Conflict Worksheet 1 Directions: Read the description of the story. Determine the protagonist (central character) and antagonist (opposing force). Then describe the type of confict (example: person vs. nature). 1. After breaking his mother’s favorite vase‚ Casey struggles to decide whether he should tell his mother the truth and face the consequences‚ or whether he should attempt to hide his mistake and blame the family dog. Protagonist: ______________________________
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Experiment 2 : Transport Across Membrane Name : Matrix No : Group : B Semester : 1 Date of Experiment : 05.09.2013 Lecturer’s Name : Miss OBJECTIVE To study the effects of hypotonic‚ hypertonic and isotonic solutions on plant and animal cells. INTRODUCTION In cellular biology the term membrane transport refers to the collection of mechanisms that regulate the passage of solutes such as ions and small molecules through biological membranes‚ which are lipid bilayers
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Graph 1‚ illustrates the pH of each quadrat. The pH in Quadrat 1 was more acidic than the pH in Quadrat 2‚ 3‚ and 4 this is due to the slope of the ground (refer to Graph 8)‚ different soil substrate and the decomposition of organic matter. As can be seen from Graph 8‚ the soil pH increased with a decrease in the slope of the ground. In Quadrat 1‚ the soil had a pH of 7.5 due to having a higher soil elevation of -8° in comparison to Quadrat 2‚ 3 and 4‚ in which the slope of the ground was -2°‚ -2°
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cause infection. The Discovery of Viruses 1. What is a bacteriophage? Kind of virus that infects bacteria. 2. What are viruses? Particle made of proteins‚ nucleic acid and sometimes lipids that can only replicate by infecting other cells. 3. What is a capsid? Protein coat surrounding a virus 4. How does a typical virus get inside a cell? Capside proteins 5. What occurs when viruses get inside cells? Virus genes are expressed
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QUESTION 1: Which three states had the largest (positive) change in average weekly earnings over this time period (remember to use the correct units in your answer)? North Dakota $30.49 Nevada $17.11 Texas $15.42 How does Florida compare to the rest of the states in terms of the change in average weekly earnings? In comparison to the other states‚ Florida ranks 25th out of 50 states and this is due to a -$1.00 change in average weekly earnings. How does New York compare to the rest of the states
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Cell Biology Exam 1 Notes Lecture 1: Introduction to Cell Biology • Biology is studied at different levels of organization Time Scale • [Figure 1-9] How big is a cell and how big are its parts? • There are important similarities that all cells share; however‚ there are also important differences among various cell types (for example‚ animal cells vs. bacterial cells) • [Figure 3-23] The inside of a cell is loaded (crowded
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