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Questions in biology

[Answered] Which of the following is true about the autonomic nervous system? A. It is made up of the brain and spinal cord. B. It takes messages from the body's internal organs to the central nervous system. C. It conveys information from the central nervous system to the skin and muscles. D. It plays the primary role in sensory perception.

[Answered] 5. When we breathe in, our chest muscles move upwards and outwards and our diaphragm moves downwards. Explain why this is. 6. In which part of the respiratory system does the oxygen from the air we breathe in pass into our blood? Tick the correct answer. - alveoli - bronchus - trachea 7. The circulatory system helps oxygen-rich blood travel around our body to different organs. - true - false 8. Why do we breathe out carbon dioxide?

[Answered] Which of the following is the part of the endocrine system that produces melatonin and regulates sleep patterns? A. Pituitary gland B. Pineal gland C. Thymus gland D. Adrenal glands

[Answered] Photosynthesis is an example of A. an exothermic reaction. B. an endothermic reaction. C. a reaction that gives off heat. D. a reaction that emits energy.

[Answered] Fill in the missing words to complete the idea of the story. A. aorta B. inferior vena cava C. right atrium D. head E. heart F. pulmonary veins G. circulatory H. oxygen I. pulmonary arteries J. carbon dioxide K. lungs L. superior vena cava M. arteries N. left atrium O. right ventricle Hi, my name is Blad and I am a red blood cell. My buddies, the ______ and blood vessels, and I form the ______ system. Through this system I carry all sorts of nutrients and oxygen to the tissues of my town, the body, and remove ______ and other wastes from them. Inside me, there is a protein called Hemoglobin that contains iron, which is like a vehicle to transport oxygen and carbon dioxide everywhere. When I go through the ______, this protein attaches to me. With the help from my best friend the heart, I am pumped and carried all over the body through ______ to perform my duties. In a day I visit my best friend countless times and always leave through the ______, which is the main artery of the body. From the aorta I can either go north to the ______ or south to the legs, arms and other parts through arteries. As I travel through the body, the arteries become thinner and thinner and become smaller vessels called arterioles. The arterioles divide into even tinier vessels called capillaries. Since the capillaries are so tiny, it is very easy to exchange material with other cells. Through the wall of the capillaries many other nutrients can come in and go out, and I lose ______ and become blue. Through this journey around my town I see all kinds of wastes, and as I return to see my friend, the heart, I bring them with me so I can help get rid of them on my way. I always visit my friend, the brain, and my other friends around the body. When I visit my friend, the brain I return through the ______, which is the highway that returns blood from the head, neck and upper limbs. When I visit my friends from the south, I come back through the ______ highway, which returns blood from the lower parts of the body. When I arrive at the heart I go through the ______, the upper chamber of the heart. Because I am blue I have to go through the ______ after I go through the right atrium. The right ventricle pumps me to see one of my friends the lungs. To see my friend I go through ______. There my friend gives me oxygen and I become red again. Happily I go back to see my friend the heart through the ______. From there I am pumped to the left ventricle. After saying my goodbyes, I exit through the ______ aorta and I can either go to see my friends in the north or revisit my friends in the south. On my daily journey around my town called the body, I go through veins in the digestive system. As the food in breaking down into simpler proteins, carbohydrates and fats in the small intestines, they are absorbed into the blood vessels, and are pumped all over the body to spread nutrients and others.

[Answered] Some materials are given below: (i) Rubber (ii) Sugar (iii) Salt (iv) Cotton (v) Sponge (vi) Brick (vii) Talc powder (viii) Wood Identify the materials which are soft and insoluble in water. A. (i), (ii), (iii), (iv) and (vi) only B. (i), (iv), (v) and (vii) only C. (ii), (iii) and (viii) only D. (ii), (iii) and (vi) only

[Answered] Write True or False for the following statements: 1. Colourless and small petals are present in water pollinated plants. 2. Zygote is the fertilized female reproductive cell. 3. Parthenocarpic plants can produce fruits without seeds. 4. Sepals can perform photosynthesis.

[Answered] Why did Mendeleev reverse the order of the tellurium (Te) and iodine (I) elements?

[Answered] Each of the following is found in the A-band of striated muscle, except: A. Z disc B. thin filaments C. H zone D. thick filaments

[Answered] Which hormone triggers the kidneys to form more concentrated urine and prevent excess water loss? A. calcitonin B. oxytocin C. ADH D. PTH