𝐒𝐂𝐈𝐄𝐍𝐂𝐄 𝐒𝐏𝐄𝐂𝐓𝐑𝐔𝐌

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Biology Grade 9  Unit 3: Human Biology and Health  Summary on Circulatory System  3.5 THE CIRCULATORY SYSTEM  • The transport system in humans is required to supply the needs of body cells and remove the waste materials they produce.  • The circulatory system has three components:    • The pipe: Blood vessels    • The pump: Heart    • The medium: Blood  • Human beings have double circulation:    • Blood enters the heart twice.    • Efficient for supplying oxygen.  I. The Blood Vessels  • There are three main types:    • Arteries: Take blood away from the heart.    • Veins: Take blood back to the heart.    • Capillaries: Join veins and arteries.  II. The Heart  • Made up of cardiac muscle.  • Supplied with oxygen by coronary artery.  • Has four chambers: 2 atria and 2 ventricles.  • Circulation of the Blood:    • Venacava → Right auricle → Right ventricle → Pulmonary artery → Lung → Pulmonary vein → Left auricle → Left ventricle → Aorta.  • The left ventricle is the thickest chamber that pumps blood to all parts of the body.  • Blood flows only in one direction because of the valves present in the heart:    • Tricuspid valve    • Bicuspid valve    • Semilunar valves  • Diastole: The heart is relaxed and filled with blood; the pressure is low.  • Systole: The heart muscle contracts and forces blood out of the heart; the pressure is high.  The Blood Components  • Oxygen is carried by hemoglobin.  • Clotting is important because it:    • Prevents bleeding.    • Prevents entry of bacteria.    • Protects new skin from damage.  Human Blood Groups  • There are four types of human blood groups.  Common Problems of the Circulatory System in Ethiopia  • Anemia: Caused by lack of iron in the diet.  • Hypertension: Condition of having high blood pressure. ➦Share   🗨️ Comment       ➣Forward 👇 Join us for more 👇 ╔═══════════╗   @omo_academy ╚═══════════╝ 𝐎𝐌𝐎 𝐀𝐂𝐀𝐃𝐄𝐌𝐘             𝒀𝒐𝒖𝒓 𝒑𝒂𝒕𝒉 𝒘𝒂𝒚 𝒕𝒐 𝒔𝒖𝒄𝒄𝒆𝒔𝒔 !

🔵 ከሰው ልጅ ታላቅ አእምሮ አንዱ የሆነው አልበርት አንስታይን መናፍስት(Ghosts) እንዳሉ ያምን ነበር። 🔵 እሱ እንደሚለው፣ የአጽናፈ ሰማይ(Universe) ሃይል ሁሉ ቋሚ ነው; ይህ ሃይል ሊጠፋ ስለማይችል ወደ አዲስ ሃይል ወይም ወደ አሉታዊ ሃይል (እንደ መናፍስት) ሊቀየር ይችላል። ስለዚህ የሰው ልጅም ሲሞት ውስጡ ያለው ሰዋዊ ሀይል(Energy System) አይጠፉም።ወደ አሉታዊ ሀይል(Ghost) ይቀየራል ብሎ ያምናል:: 📱@Amazing_fact_433 📱@Amazing_fact_433

Math

Choose the correct answer from the following alternatives Types of Functions:

1. Which type of function has a one-to-one correspondence between its domain and range?   a) Linear function   b) Quadratic function   c) Bijective function   d) Inverse function 2. A function that maps each element of its domain to a single element in its range is called a:   a) Surjective function   b) Injective function   c) Bijective function   d) Constant function 3. A quadratic function is characterized by its graph being a:   a) Straight line   b) Parabola   c) Circle   d) Hyperbola 4. What type of function always has a horizontal asymptote?   a) Exponential function   b) Logarithmic function   c) Trigonometric function   d) Polynomial function 5. A function that maps every element in its range to at least one element in its domain is called a:   a) Surjective function   b) Injective function   c) Bijective function   d) Constant function Combinations of Functions: 6. The composition of functions, f(g(x)), means:   a) Multiplying the functions f(x) and g(x)   b) Adding the functions f(x) and g(x)   c) Applying the function g(x) first and then f(x)   d) Applying the function f(x) first and then g(x) 7. The sum of two functions, f(x) + g(x), is obtained by:   a) Adding the corresponding y-values for each x-value   b) Multiplying the corresponding y-values for each x-value   c) Dividing the corresponding y-values for each x-value   d) Subtracting the corresponding y-values for each x-value 8. Which of the following is NOT a standard operation on functions?   a) Composition   b) Summation   c) Multiplication   d) Differentiation 9. The product of two functions, f(x) * g(x), is obtained by:   a) Adding the corresponding y-values for each x-value   b) Multiplying the corresponding y-values for each x-value   c) Dividing the corresponding y-values for each x-value   d) Subtracting the corresponding y-values for each x-value 10. Given two functions, f(x) and g(x), the domain of (f o g)(x) is:   a) The intersection of the domains of f(x) and g(x)   b) The union of the domains of f(x) and g(x)   c) The domain of g(x) only   d) The domain of f(x) only

Domain, Codomain, and Range:

11. The set of all possible input values for a function is called its:   a) Range   b) Domain   c) Codomain   d) Image 12. The set of all possible output values for a function is called its:   a) Range   b) Domain   c) Codomain   d) Image 13. The set of all output values that are actually produced by a function is called its:   a) Range   b) Domain   c) Codomain   d) Image 14. Which of the following is TRUE about the domain of a function?   a) It is always a subset of the codomain.   b) It is always a superset of the codomain.   c) It is always equal to the codomain.   d) It can be any set, including those that are not related to the codomain. 15. The codomain of a function is:   a) The set of all possible input values.   b) The set of all possible output values.   c) The set of all actual output values.   d) None of the above 16. The range of a function can be:   a) Equal to the codomain   b) A subset of the codomain   c) A superset of the codomain   d) Both a and b 17. Which of the following is an example of a function where the range is equal to the codomain?   a) f(x) = x² (for all real numbers)   b) f(x) = sin(x) (for all real numbers)   c) f(x) = 1/x (for all real numbers except 0)   d) None of the above 18. Which of the following is an example of a function where the range is a subset of the codomain?   a) f(x) = x² (for all real numbers)   b) f(x) = sin(x) (for all real numbers)   c) f(x) = 1/x (for all real numbers except 0)   d) All of the above 19. Which of the following is NOT a valid way to represent a function?   a) Graph   b) Table   c) Equation   d) Diagram 20. A function can have multiple codomains.   a) True   b) False

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