ATI TEAS 7
Science TEAS Practice Test
1. What is the role of hemoglobin in the human body?
- A. Transport oxygen in red blood cells
- B. Bind oxygen to red blood cells
- C. Carry carbon dioxide from tissues to lungs
- D. Help red blood cells transport oxygen
Correct answer: D
Rationale: The correct answer is D: 'Help red blood cells transport oxygen.' Hemoglobin acts as a carrier molecule in red blood cells, binding to oxygen in the lungs and releasing it in the tissues. It facilitates the transport of oxygen from the lungs to the tissues and aids in returning carbon dioxide from the tissues to the lungs. Choices A, B, and C are incorrect because hemoglobin itself does not transport oxygen independently or bind oxygen to red blood cells nor does it carry carbon dioxide from tissues to lungs; instead, it assists red blood cells in the transportation of oxygen.
2. The adrenal glands are part of which system?
- A. Immune system
- B. Endocrine system
- C. Lymphatic system
- D. Respiratory system
Correct answer: B
Rationale: The correct answer is B: Endocrine system. The adrenal glands are part of the endocrine system, not the immune, lymphatic, or respiratory system. The endocrine system is responsible for producing and regulating hormones that control various bodily functions. The adrenal glands specifically produce hormones like cortisol and adrenaline, which are critical for the body's response to stress and metabolic processes. The immune system is responsible for defending the body against infections and diseases, the lymphatic system is involved in immunity and fluid balance, and the respiratory system is responsible for gas exchange in the body. Therefore, choices A, C, and D are incorrect in the context of the adrenal glands.
3. When human cells divide by meiosis, how many chromosomes do the resulting cells contain?
- A. 96
- B. 54
- C. 46
- D. 23
Correct answer: D
Rationale: When human cells divide by meiosis, the resulting cells contain 23 chromosomes. This is because meiosis is a cell division process that reduces the chromosome number by half, resulting in cells with a haploid number of chromosomes. In humans, the diploid number of chromosomes is 46. Therefore, after meiosis, the resulting cells have 23 chromosomes, ensuring the correct chromosome number is restored upon fertilization. Choices A, B, and C are incorrect as they do not represent the correct chromosome number resulting from meiosis in human cells.
4. Which of the following statements is true about the immune system?
- A. The immune system is controlled by the hypothalamus.
- B. The immune system filters toxins out of the blood.
- C. The immune system stimulates the production of blood cells in response to infections.
- D. The immune system helps the body avoid, detect, and eliminate infections.
Correct answer: D
Rationale: The correct answer is D. The immune system's primary function is to help the body avoid, detect, and eliminate infections. It does so by recognizing and responding to harmful pathogens, such as bacteria and viruses, to maintain the body's health and well-being. Choices A, B, and C are incorrect because the immune system is not controlled by the hypothalamus, its main role is not to filter toxins out of the blood, and while it can stimulate the production of certain immune cells, it does not directly stimulate the production of blood cells in response to infections.
5. What is the name for the sac-shaped structures in which carbon dioxide and oxygen exchange takes place?
- A. Kidneys
- B. Medulla oblongata
- C. Alveoli
- D. Bronchioles
Correct answer: C
Rationale: The alveoli are the tiny sac-shaped structures in the lungs where gas exchange occurs. Oxygen from the air we breathe diffuses into the bloodstream through the alveoli, while carbon dioxide, a waste product produced by cells, is removed from the blood and exhaled out of the body through the alveoli. Choices A, B, and D are incorrect. Kidneys are organs responsible for filtering waste from the blood, the medulla oblongata is a part of the brain responsible for autonomic functions, and bronchioles are smaller airway passages in the lungs that branch off from the bronchi.
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