What is the primary physiological function of erythrocytes in the human circulatory system?
A. Facilitation of gas exchange in the alveoli
B. Regulation of blood pH through the release of bicarbonate ions
C. Transportation of oxygen to body tissues
D. Synthesis of clotting factors in response to vascular injury
Red blood cells, also known as erythrocytes, play a crucial role in the circulatory system, primarily by facilitating the transportation of oxygen to body tissues. The other choices are also explained below:
A. Facilitation of gas exchange in the alveoli: While gas exchange occurs in the alveoli of the lungs, it is primarily carried out by the respiratory system and involves the exchange of oxygen and carbon dioxide between air and blood. Red blood cells do not directly participate in this process.
B. Regulation of blood pH through the release of bicarbonate ions: The regulation of blood pH is mainly maintained by the bicarbonate buffering system, which involves the action of the respiratory and renal systems. Red blood cells do play a minor role in transporting carbon dioxide, which can indirectly influence pH, but it's not their primary function.
D. Synthesis of clotting factors in response to vascular injury: Clotting factors are primarily produced by the liver and are involved in the blood clotting process to prevent excessive bleeding. Red blood cells are not directly responsible for synthesizing these factors.
Therefore, the Correct Answer is C.
More Questions on TEAS 7 Science
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Q #1: What is the name of the joint that allows for rotation of the arm at the shoulder?
A. Elbow joint
B. Hip joint
C. Knee joint
D. Shoulder joint
Answer Explanation
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Q #2: During embryonic development, which of the following germ layers forms the nervous system?
A. Ectoderm
B. Endoderm
C. Mesoderm
D. Exoderm
Answer Explanation
The three germ layers that form during embryonic development are the ectoderm, mesoderm, and endoderm. The ectoderm is the outermost layer, and it gives rise to the skin, hair, nails, and nervous system. The nervous system develops from a specialized region of the ectoderm called the neural plate, which invaginates to form the neural tube. The neural tube ulmately gives rise to the brain and spinal cord, which make up the central nervous system, as well as the peripheral nervous system. The endoderm gives rise to the lining of the digesve and respiratory tracts, while the mesoderm gives rise to the musculoskeletal system, circulatory system, and several other organs. The exoderm is not a germ layer and does not exist during embryonic development.
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Q #3: What is the difference between a monosaccharide and a disaccharide?
A. Monosaccharides are composed of two sugar molecules while disaccharides are composed of a single sugar molecule.
B. Monosaccharides are simple sugars that cannot be further broken down into simpler sugars while disaccharides are composed of two simple sugars.
C. Monosaccharides are only found in plants while disaccharides are only found in animals.
D. Monosaccharides are used for energy storage while disaccharides are used for structural purposes.
Answer Explanation
Carbohydrates are one of the main types of biomolecules and are composed of monomers called monosaccharides. Monosaccharides are simple sugars that cannot be further broken down into simpler sugars. They are usually composed of 3 to 7 carbon atoms and have a general formula of (CH2O)n, where n is a number between 3 and 7. Examples of monosaccharides include glucose, fructose, and galactose.
When two monosaccharides are joined together by a glycosidic bond, they form a disaccharide. Disaccharides are composed of two simple sugars and can be broken down into their constituent monosaccharides by hydrolysis. Examples of disaccharides include sucrose, lactose, and maltose.
Option a) is incorrect because it describes the composition of a disaccharide, not a monosaccharide. Option
c) is incorrect because both monosaccharides and disaccharides can be found in both plants and animals.
Option d) is incorrect because both monosaccharides and disaccharides can be used for energy storage and
structural purposes, depending on their specific structure and function in the organism.
