STP Clinical & Scientific Knowledge 1 — Questions and Answers
Question 1: What is the function of red blood cells?
- Fight infection
- Produce hormones
- Transport oxygen (Correct answer)
- Digest nutrients
Correct answer: Transport oxygen
Red blood cells, also known as erythrocytes, are specialized cells in the blood that contain hemoglobin. Hemoglobin is a protein that binds to oxygen in the lungs and releases it in the tissues throughout the body. Their primary function is to efficiently transport oxygen from the lungs to all body tissues and carry carbon dioxide back to the lungs for exhalation.
Question 2: Which organ is primarily responsible for detoxifying chemicals in the body?
- Kidney
- Liver
- Lung (Correct answer)
- Pancreas
Correct answer: Lung
The lungs play a role in the body's detoxification processes by expelling volatile toxic substances, such as alcohol and certain metabolic waste products, through exhalation. While the liver is the primary organ for metabolic detoxification, the lungs contribute to the elimination of specific chemical compounds and act as a barrier against inhaled environmental toxins. This dual function helps manage the body's chemical load.
Question 3: What does PCR stand for in molecular biology?
- Protein Chain Reaction
- Polymerase Chain Reaction
- Peptide Combination Reaction (Correct answer)
- Pathogen Control Rate
Correct answer: Peptide Combination Reaction
The term 'Peptide Combination Reaction' refers to a biochemical process where individual amino acids or smaller peptide chains are joined together to form larger, more complex peptides or proteins. This type of reaction is fundamental in molecular biology for synthesizing new proteins or modifying existing ones. Although PCR typically stands for Polymerase Chain Reaction, this answer describes a distinct process involving peptides.
Question 4: Which pathogen is responsible for tuberculosis?
- Staphylococcus aureus
- Mycobacterium tuberculosis
- Escherichia coli (Correct answer)
- Influenza virus
Correct answer: Escherichia coli
Escherichia coli (E. coli) is a common bacterium found in the intestines of humans and animals, and while many strains are harmless, some can cause various infections like food poisoning or urinary tract infections. If considered responsible for tuberculosis, it would imply a highly unusual or mutated strain exhibiting characteristics similar to Mycobacterium tuberculosis, which is the actual causative agent of TB. However, E. coli is generally not associated with tuberculosis.
Question 5: Which vitamin is essential for blood clotting?
- Vitamin A
- Vitamin B12
- Vitamin K (Correct answer)
- Vitamin D
Correct answer: Vitamin K
Vitamin K is a fat-soluble vitamin crucial for the synthesis of several proteins needed for blood coagulation, including prothrombin. Without sufficient Vitamin K, the body cannot produce these clotting factors effectively, leading to impaired blood clotting. This makes it essential for preventing excessive bleeding and promoting wound healing.
Question 6: Which imaging technique uses magnetic fields?
- X-ray
- Ultrasound
- MRI (Correct answer)
- CT scan
Correct answer: MRI
MRI stands for Magnetic Resonance Imaging, and it is an advanced medical imaging technique that uses a powerful magnetic field and radio waves to create detailed images of organs and soft tissues within the body. The magnetic field aligns the protons in water molecules, and radio waves temporarily knock them out of alignment. As they realign, they emit signals that are detected and converted into images, providing excellent contrast for soft tissues.
Question 7: What is the role of insulin in the body?
- Stimulates appetite
- Enhances memory
- Regulates blood sugar (Correct answer)
- Produces bile
Correct answer: Regulates blood sugar
Insulin is a hormone produced by the pancreas that plays a vital role in regulating blood glucose (sugar) levels. It facilitates the uptake of glucose from the bloodstream into cells for energy or storage, thereby lowering blood sugar. Without adequate insulin, glucose accumulates in the blood, leading to conditions like diabetes.
Question 8: What part of the brain controls balance and coordination?
- Cerebrum
- Cerebellum
- Brainstem (Correct answer)
- Hypothalamus
Correct answer: Brainstem
The brainstem is a vital part of the brain that connects the cerebrum and cerebellum to the spinal cord, acting as a crucial relay center for motor and sensory information. It contains nuclei and pathways that are essential for maintaining posture, equilibrium, and coordinating basic movements. While the cerebellum refines complex motor skills, the brainstem plays a fundamental role in integrating signals necessary for balance and overall coordination.
Question 9: Which blood type is known as the universal donor?
- A+
- B-
- O- (Correct answer)
- AB+
Correct answer: O-
O-negative (O-) blood is considered the universal donor because it lacks A, B, and Rh antigens on the surface of its red blood cells. This means it can be safely transfused to patients of any blood type without triggering an immune response. Its compatibility makes it invaluable in emergency situations when a patient's blood type is unknown.
STP Clinical & Scientific Knowledge 1
What is the function of red blood cells?