NCBTMB Anatomy and Physiology Questions and Answers — Questions and Answers
Question 1: A client presents with pain and tingling radiating from the neck down to the arm and hand. The massage therapist suspects an impingement of the brachial plexus. Which group of spinal nerves forms this plexus?
- C1-C4
- C5-T1 (Correct answer)
- T2-T8
- L1-L5
Correct answer: C5-T1
The brachial plexus is a complex network of nerves formed by the anterior rami of the cervical spinal nerves C5, C6, C7, C8, and the first thoracic spinal nerve, T1. This network is responsible for the motor and sensory innervation of the upper limbs, including the shoulder, arm, and hand. Issues in this area can lead to symptoms like pain, tingling, and numbness down the arm.
Question 2: During a stretching session, a therapist is explaining proprioception to a client. Which proprioceptor is primarily responsible for sensing changes in muscle tension, thereby protecting the muscle from excessive force by causing it to relax?
- Muscle Spindle
- Pacinian Corpuscle
- Golgi Tendon Organ (Correct answer)
- Ruffini's End Organ
Correct answer: Golgi Tendon Organ
The Golgi Tendon Organ (GTO) is a proprioceptive sensory receptor located at the junction between muscle fibers and tendons. Its primary function is to sense changes in muscle tension. When tension becomes too high, the GTO sends a signal that inhibits muscle contraction, causing the muscle to relax as a protective mechanism against injury.
Question 3: A client is performing a bicep curl. This movement, which involves flexion and extension at the elbow, occurs primarily in which anatomical plane?
- Frontal (Coronal) Plane
- Transverse (Axial) Plane
- Oblique Plane
- Sagittal Plane (Correct answer)
Correct answer: Sagittal Plane
The sagittal plane divides the body into left and right halves. Movements that occur in this plane are forward and backward motions, such as flexion and extension. A bicep curl is a classic example of elbow flexion, which takes place directly within the sagittal plane.
Question 4: Which of the following is an absolute contraindication for manual lymphatic drainage (MLD), meaning the therapy should not be performed under any circumstances?
- First trimester of pregnancy
- Chronic sinusitis
- Congestive Heart Failure (Correct answer)
- Post-surgical edema
Correct answer: Congestive Heart Failure
Congestive Heart Failure (CHF) is an absolute contraindication for Manual Lymphatic Drainage. MLD increases the volume of fluid returning to the heart, which can overwhelm an already compromised cardiac system and worsen the condition. Other absolute contraindications include acute infections, deep vein thrombosis (blood clots), and certain kidney failures.
Question 5: A massage therapist is working with an athlete to improve their range of motion using Proprioceptive Neuromuscular Facilitation (PNF) stretching. What is the physiological principle behind the 'contract-relax' technique?
- Activating muscle spindles to initiate a stretch reflex.
- Stimulating the Golgi tendon organs to cause muscle relaxation. (Correct answer)
- Increasing blood flow to flush out lactic acid.
- Creating micro-tears in the muscle fascia to promote growth.
Correct answer: Stimulating the Golgi tendon organs to cause muscle relaxation.
PNF stretching techniques, such as 'contract-relax', work by stimulating the Golgi tendon organs (GTOs). When a muscle is isometrically contracted against resistance, the GTOs sense the increase in tension and send signals to the central nervous system, which then causes a reflex relaxation (autogenic inhibition) of the same muscle. This relaxation allows the muscle to be stretched further than it could passively.
Question 6: According to the sliding filament theory of muscle contraction, what event is the immediate trigger for the myosin heads to form a cross-bridge with the actin filaments?
- The release of acetylcholine at the neuromuscular junction.
- The breakdown of ATP into ADP and a phosphate group.
- The binding of calcium ions to troponin. (Correct answer)
- The repolarization of the sarcolemma.
Correct answer: The binding of calcium ions to troponin.
In the sliding filament theory, a nerve impulse leads to the release of calcium ions from the sarcoplasmic reticulum. These calcium ions then bind to troponin, which causes the other protein, tropomyosin, to move and expose the active binding sites on the actin filaments. This exposure allows the energized myosin heads to attach to the actin, forming a cross-bridge and initiating the contraction cycle.
NCBTMB Anatomy and Physiology Questions and Answers
A client presents with pain and tingling radiating from the neck down to the arm and hand.
The massage therapist suspects an impingement of the brachial plexus.
Which group of spinal nerves forms this plexus?