The primary muscle of breathing is the:
internal intercostal
diaphragm
external intercostal
rectus abdominis
The Correct Answer is B
Rationale:
A. Internal intercostal muscles assist with forced expiration by pulling the ribs downward and inward but are not the primary muscle for breathing.
B. Diaphragm is the main muscle of inspiration; when it contracts, it flattens and increases the thoracic cavity volume, allowing air to flow into the lungs. The diaphragm’s continuous rhythmic activity is essential for effective ventilation.
C. External intercostal muscles assist with inspiration by elevating the ribs, but their role is secondary to the diaphragm.
D. Rectus abdominis muscles are involved in forced expiration and trunk movement but do not serve as the primary muscle for breathing.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Rationale:
A. Cyanosis refers to a bluish discoloration of the skin, lips, or nail beds due to inadequate oxygenation of the blood or poor circulation. It is often seen in conditions such as respiratory distress, heart disease, or hypothermia.
B. Refers to redness of the skin, usually caused by increased blood flow to the capillaries in response to fever, inflammation, infection, or sunburn.
C. Pallor refers to paleness of the skin, often due to reduced blood flow, anemia, shock, or hypothermia.
D. Jaundice refers to a yellow discoloration of the skin and eyes caused by elevated bilirubin levels, often due to liver dysfunction or bile duct obstruction.
Correct Answer is A
Explanation
Rationale:
A. The joints between the vertebrae are examples of amphiarthroses, which are slightly movable joints connected by cartilage (intervertebral discs). These joints provide both support and flexibility, allowing limited motion while protecting the spinal cord.
B. The wrist contains synovial joints (diarthroses), which allow free movement in multiple directions, not amphiarthrosis.
C. The shoulder joint is a ball-and-socket synovial joint, making it freely movable (diarthrosis), not slightly movable.
D. The sutures of the skull are synarthroses, which are immovable fibrous joints.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.