Nokea
What percentage of a female's blood volume is composed of red blood cells?
- A. 10%
- B. 25%
- C. 40%
- D. 70%
Correct Answer: C
Rationale: Approximately 40% of a female's blood volume is composed of red blood cells, a proportion known as hematocrit. This percentage may vary slightly based on factors like age and overall health. Red blood cells play a crucial role in oxygen transport throughout the body, and deviations from the normal range can indicate various medical conditions.
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What is the primary function of the respiratory system?
- A. To digest food
- B. To control body movement
- C. To transport oxygen and carbon dioxide
- D. To circulate blood
Correct Answer: C
Rationale: The primary function of the respiratory system is to transport oxygen from the air into the body and remove carbon dioxide from the body. Oxygen is necessary for cells to produce energy through a process called cellular respiration, and carbon dioxide is a waste product that needs to be eliminated. Therefore, the correct answer is C, 'To transport oxygen and carbon dioxide.' Digesting food (choice A) is the primary function of the digestive system, controlling body movement (choice B) is the role of the muscular system, and circulating blood (choice D) is the function of the circulatory system.
Where do spermatozoa develop in men?
- A. Seminiferous tubules
- B. Vas deferens
- C. Ejaculatory ducts
- D. Bulbourethral glands
Correct Answer: A
Rationale: Spermatozoa develop within the seminiferous tubules of each testis. These tubules are responsible for the production of sperm through a process called spermatogenesis. While the vas deferens, ejaculatory ducts, and bulbourethral glands play essential roles in the transport and release of sperm, they are not involved in the actual development of sperm.
Which tissue serves as the framework of the body by providing support and structure for the organs?
- A. Epithelial
- B. Connective
- C. Nervous
- D. Muscle
Correct Answer: B
Rationale: Connective tissue serves as the framework of the body by providing support and structure for the organs. It is composed of cells and extracellular matrix, giving it strength and flexibility. Examples of connective tissue include bone, cartilage, and tendons, which play crucial roles in maintaining the body's shape and integrity.
Which type of cholesterol is considered the healthiest?
- A. LDL
- B. HDL
- C. VLDL
- D. VHDL
Correct Answer: B
Rationale: High-density lipoprotein (HDL) is considered the healthiest type of cholesterol because it helps remove LDL cholesterol from the arteries, reducing the risk of heart disease. HDL acts as a scavenger, picking up excess cholesterol in the blood and transporting it back to the liver for removal from the body. This is why HDL is often referred to as 'good' cholesterol, emphasizing its protective role in cardiovascular health.
Which type of skin cancer can be recognized in lesion characteristics based on the ABCD rule?
- A. Melanoma
- B. Basal cell carcinoma
- C. Sarcoma
- D. Squamous cell carcinoma
Correct Answer: B
Rationale: The ABCD rule is a method used to identify characteristics associated with melanoma, not basal cell carcinoma. The letters stand for Asymmetry, Border irregularity, Color variation, and Diameter greater than 6mm. Basal cell carcinoma is the most common type of skin cancer, but it is not typically identified using the ABCD rule. Melanoma is the correct answer as it is the type of skin cancer recognized based on the ABCD rule.