Nokea
Which organ system is primarily responsible for generating antibodies?
- A. The endocrine system
- B. The digestive system
- C. The lymphatic system
- D. The nervous system
Correct Answer: C
Rationale: The correct answer is C: The lymphatic system. Antibodies are produced by specialized white blood cells called B-lymphocytes (or B cells) in response to foreign substances known as antigens. The lymphatic system includes lymph nodes, lymphatic vessels, tonsils, thymus, and spleen, which work together to produce and store antibodies to help the body fight off infections and diseases.
Choice A, the endocrine system, is incorrect because it is responsible for hormone regulation, not antibody production.
Choice B, the digestive system, is incorrect because its main function is to break down food and absorb nutrients, not produce antibodies.
Choice D, the nervous system, is incorrect as it is responsible for transmitting signals throughout the body and coordinating body functions, not generating antibodies.
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How might the headrest on a car prevent traumatic injury?
- A. By limiting hyperflexion of the neck
- B. By limiting hyperextension of the neck
- C. By reducing vertebral compression
- D. By preventing disc degeneration
Correct Answer: B
Rationale: The headrest on a car is designed to prevent traumatic injury by limiting hyperextension of the neck during a rear-end collision. This helps reduce the risk of whiplash and other neck injuries that may occur when the head is forcefully thrown backward. Choice A is incorrect because hyperflexion is not the primary concern in rear-end collisions. Choice C is incorrect as the headrest does not directly reduce vertebral compression. Choice D is incorrect because the headrest is not directly involved in preventing disc degeneration.
How does the lymphatic system work with the circulatory system?
- A. The circulatory system produces red blood cells for the lymphatic system.
- B. Lymph draws excess fluid from the cells and deposits it into the blood vessels.
- C. The heart regulates the production of lymph in the lymph glands.
- D. White cells from the lymphatic system eliminate excess red blood cells.
Correct Answer: B
Rationale: The lymphatic system works with the circulatory system by draining excess fluid and waste products from the spaces between cells, known as interstitial fluid. This excess fluid, now called lymph, is then transported back into the blood circulation through lymphatic vessels. This process helps maintain fluid balance in the body and supports the circulatory system in regulating blood volume and pressure. Choice A is incorrect because the circulatory system does not produce red blood cells for the lymphatic system. Choice C is incorrect as the heart does not regulate lymph production in lymph glands. Choice D is incorrect as white cells from the lymphatic system do not eliminate excess red blood cells. Therefore, the correct answer is B, as lymph draws excess fluid from the cells and deposits it into the blood vessels, aiding in maintaining proper fluid balance and supporting the circulatory system.
The cheekbones are positioned ___________ to the nose.
- A. anterior
- B. proximal
- C. deep
- D. lateral
Correct Answer: D
Rationale: The term 'lateral' refers to the direction away from the midline of the body. In this case, the cheekbones are situated to the sides of the nose, making them lateral to the nose. Therefore, 'lateral' correctly describes the position of the cheekbones in relation to the nose. Choices A, B, and C are incorrect:
A. 'Anterior' means situated at or towards the front, which is not the correct description of the cheekbones in relation to the nose.
B. 'Proximal' means situated nearer to the center of the body, which is not the correct description of the cheekbones' position in relation to the nose.
C. 'Deep' refers to being situated further away from the surface, which is not the appropriate term to describe the cheekbones' position in relation to the nose.
How does a sagittal section divide the body?
- A. Into right and left regions
- B. Into upper and lower regions
- C. Into front and back regions
- D. Between the dorsal and ventral cavities
Correct Answer: A
Rationale: A sagittal section divides the body into right and left regions. This type of section runs longitudinally from front to back, separating the body into right and left halves. Sagittal sections are crucial for understanding the anatomical structure and orientation of various body parts. Choices B, C, and D are incorrect because a sagittal section specifically divides the body into right and left portions, not upper and lower regions, front and back regions, or between the dorsal and ventral cavities.
Which of the following epithelial types is correctly matched with its major function?
- A. Simple squamous epithelium - diffusion
- B. Stratified squamous epithelium - protection
- C. Stratified squamous epithelium - diffusion
- D. Simple columnar epithelium - secretion or absorption
Correct Answer: D
Rationale: The correct answer is D. Simple columnar epithelium is indeed primarily responsible for secretion and absorption due to its tall shape and presence of microvilli, which increase surface area for these functions. Simple squamous epithelium is mainly involved in diffusion, allowing for the exchange of gases or nutrients. Stratified squamous epithelium functions more for protection against mechanical stress and pathogens, as it forms a tough, protective barrier due to its many layers.