CBET Anatomy and Physiology Basics 2 — Questions and Answers
Question 1: Which organ is primarily responsible for filtering blood and producing urine in the human body?
- Liver
- Kidney (Correct answer)
- Spleen
- Pancreas
Correct answer: Kidney
The kidneys filter blood to remove waste products and excess fluids, producing urine as a byproduct of this filtration process.
The kidneys are bean-shaped organs located on either side of the spine in the retroperitoneal space. Each kidney contains approximately one million nephrons, which are the functional units responsible for filtering blood. Biomedical equipment technicians working with dialysis machines must understand this process, as hemodialysis replicates kidney filtration externally.
Question 2: What is the primary function of hemoglobin in red blood cells?
- Fighting infection
- Transporting oxygen (Correct answer)
- Blood clotting
- Producing antibodies
Correct answer: Transporting oxygen
Hemoglobin is the iron-containing protein in red blood cells that binds to oxygen in the lungs and transports it to tissues throughout the body.
Hemoglobin (Hb) is a quaternary protein consisting of four polypeptide chains, each containing a heme group with a central iron atom. Pulse oximeters measure the ratio of oxyhemoglobin to deoxyhemoglobin using two wavelengths of light (660nm red and 940nm infrared) to determine blood oxygen saturation (SpO2).
Question 3: The sinoatrial (SA) node is located in which chamber of the heart?
- Left atrium
- Right atrium (Correct answer)
- Left ventricle
- Right ventricle
Correct answer: Right atrium
The SA node, often called the heart's natural pacemaker, is located in the upper wall of the right atrium near the superior vena cava opening.
The sinoatrial node is a small cluster of specialized cardiac cells located in the wall of the right atrium. It generates electrical impulses at a rate of 60-100 beats per minute. Understanding the cardiac conduction system is essential for biomedical technicians servicing ECG monitors, defibrillators, and implantable pacemakers.
Question 4: Which type of muscle tissue is found exclusively in the walls of the heart?
- Smooth muscle
- Skeletal muscle
- Cardiac muscle (Correct answer)
- Visceral muscle
Correct answer: Cardiac muscle
Cardiac muscle (myocardium) is a unique type of striated muscle found only in the heart, capable of involuntary rhythmic contractions.
Cardiac muscle tissue is distinct from both skeletal and smooth muscle. Cardiac muscle cells are connected by intercalated discs containing gap junctions, which allow rapid electrical signal transmission between cells, enabling the heart to contract as a coordinated unit (functional syncytium).
Question 5: What is the normal range for adult resting respiratory rate in breaths per minute?
- 6-10
- 12-20 (Correct answer)
- 22-30
- 30-40
Correct answer: 12-20
The normal adult resting respiratory rate is 12-20 breaths per minute, which is a vital sign commonly monitored by patient monitoring equipment.
Normal adult respiratory rate at rest is 12-20 breaths per minute. Biomedical technicians must understand respiratory physiology when calibrating and maintaining ventilators, capnography monitors, and pulse oximeters. Proper alarm limit settings depend on understanding normal physiological ranges.
Question 6: Which part of the nervous system controls involuntary functions such as heart rate and digestion?
- Somatic nervous system
- Central nervous system
- Autonomic nervous system (Correct answer)
- Peripheral motor system
Correct answer: Autonomic nervous system
The autonomic nervous system (ANS) controls involuntary body functions including heart rate, blood pressure, digestion, and respiratory rate.
The autonomic nervous system is divided into the sympathetic (fight-or-flight) and parasympathetic (rest-and-digest) branches. Many medical devices interact with or monitor ANS function. Heart rate variability analysis on ECG monitors reflects autonomic balance.
CBET Anatomy and Physiology Basics 2
Which organ is primarily responsible for filtering blood and producing urine in the human body?