CMT Anatomy and Physiology Basics 2 — Questions and Answers
Question 1: Which organ is primarily responsible for filtering blood and producing urine?
- Liver
- Kidney (Correct answer)
- Spleen
- Pancreas
Correct answer: Kidney
The kidneys filter blood, remove waste products, and produce urine as part of the renal system.
The kidneys are bean-shaped organs located in the retroperitoneal space. They filter approximately 180 liters of blood daily through nephrons, removing metabolic waste products like urea and creatinine. The filtrate is concentrated into urine, which travels through the ureters to the bladder for storage and eventual elimination.
Question 2: The trachea divides into two main branches called:
- Alveoli
- Bronchi (Correct answer)
- Bronchioles
- Pleura
Correct answer: Bronchi
The trachea bifurcates at the carina into the right and left main bronchi, which enter each lung.
The trachea, or windpipe, extends from the larynx and divides at the carina (approximately at the level of T4-T5 vertebrae) into the right and left main bronchi. The right bronchus is wider, shorter, and more vertical than the left, which is why aspirated foreign objects more commonly lodge in the right bronchus. The bronchi further subdivide into smaller bronchioles within the lungs.
Question 3: What type of muscle tissue is found in the walls of blood vessels?
- Skeletal muscle
- Cardiac muscle
- Smooth muscle (Correct answer)
- Striated voluntary muscle
Correct answer: Smooth muscle
Smooth muscle lines the walls of blood vessels and controls vasoconstriction and vasodilation.
Smooth muscle is an involuntary, non-striated muscle tissue found in the walls of blood vessels (tunica media), the gastrointestinal tract, the bladder, and other hollow organs. In blood vessels, smooth muscle contraction causes vasoconstriction (narrowing), increasing blood pressure, while relaxation causes vasodilation (widening), decreasing blood pressure. This is regulated by the autonomic nervous system and various hormones.
Question 4: The cerebellum is primarily responsible for:
- Regulating body temperature
- Coordinating voluntary movement and balance (Correct answer)
- Processing visual information
- Controlling heart rate
Correct answer: Coordinating voluntary movement and balance
The cerebellum coordinates voluntary movements, maintains posture, and helps with balance and equilibrium.
The cerebellum, located in the posterior cranial fossa, receives input from sensory systems, the spinal cord, and other parts of the brain to fine-tune motor actions. It does not initiate movement but coordinates timing, force, and accuracy. Damage to the cerebellum results in ataxia (uncoordinated movements), dysmetria (inability to judge distances), and intention tremor, though it does not cause paralysis.
Question 5: Which blood cells are primarily responsible for transporting oxygen?
- White blood cells
- Platelets
- Red blood cells (Correct answer)
- Plasma cells
Correct answer: Red blood cells
Red blood cells (erythrocytes) contain hemoglobin, which binds to oxygen for transport throughout the body.
Red blood cells (erythrocytes) are biconcave disc-shaped cells that lack a nucleus in their mature form. They contain hemoglobin, a protein with four iron-containing heme groups, each capable of binding one oxygen molecule. A single RBC contains approximately 270 million hemoglobin molecules. The average lifespan of an RBC is 120 days, after which it is removed by the spleen and liver.
Question 6: 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, the heart's natural pacemaker, is located in the upper wall of the right atrium.
The sinoatrial node is a small cluster of specialized cardiac cells located in the superior posterolateral wall of the right atrium, near the junction of the superior vena cava. It generates electrical impulses at a rate of 60-100 beats per minute at rest, making it the heart's natural pacemaker. The impulse travels through the atria to the atrioventricular (AV) node, then through the bundle of His and Purkinje fibers to the ventricles.
CMT Anatomy and Physiology Basics 2
Which organ is primarily responsible for filtering blood and producing urine?