Biology s3, 3rd. term quest feb 2014

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Biology s3, 3rd. term quest feb 2014

  1. 1. Materia: Biology Senior 3 Profesora: Ma. Magdalena Ravagnan Contenido nodal: Maintenance of the organisms TERCER TRIMESTRE Fecha de presentación: February 2014 A- Heart and circulation 1) Fig. 8.1 shows a diagram of a section through the heart. (a) On Fig. 8.1: (i) label an atrium; [1] (ii) label the pulmonary vein; [1] (iii) shade in the chambers that contain deoxygenated blood. [1] (b) Name the blood vessel that delivers blood to the muscles of the heart. ……………………………………………………………………………………………………………….[1] (c) State two preventive actions a person could take to reduce the chance of a heart …………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………
  2. 2. B- Respiration 1) Define the term respiration. 2) During exercise muscles need to obtain energy even when there is no supply of oxygen. a- Name the type of respiration in muscle cells during exercise. : ……………………………………….. b- Write the formula for the respiration named above, in words. ………………………………………………………………………………………….. c. During respiration in yeast, other products are produced. Write the formula and underline the products. 3 ) Why do you think your breathing rate and heart rate stay high for some time after completing a spell of vigorous exercise? C- Gas exchange a- Explain the role of the following structures during exhalation Diaphragm: ……………………………………………………… Intercostal muscles: ………………………………………………. Volume of rib cage: ……………………………………………………. Pressure in lungs: …………………………………………………………… b- i- Name the gas exchange surface in humans. ii- Explain what causes the oxygen and carbon dioxide diffuse for gas exchange. .

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