Nursing Elites

1. Which of the following is not part of the axial skeletal system?

• A. the skull
• B. the ribs
• C. the breastbone
• D. the radius

Correct answer: D

Rationale: The correct answer is D, the radius. The axial skeleton comprises bones located along the central axis of the body. It includes the skull, ribs, breastbone (sternum), vertebrae, and sacrum. The radius, on the other hand, is a bone of the forearm, part of the appendicular skeleton. The appendicular skeleton consists of the bones of the limbs and their girdles, not the central axial bones.

2. Which of the following is true about skeletal muscle?

• A. Skeletal muscle makes up 40% of the body's weight.
• B. Skeletal muscle attaches to bones by tendons.
• C. Muscle contraction is not involved in temperature regulation.
• D. Skeletal muscles contract only when in use.

Correct answer: B

Rationale: The correct statement is that skeletal muscle attaches to bones through tendons, enabling movement. Tendons connect muscles to bones and allow the force generated by muscle contraction to be transmitted to the bones, facilitating voluntary movements. Choice A is incorrect because skeletal muscle typically makes up around 40-50% of an individual's body weight, not a fixed 40%. Choice C is incorrect as muscle contraction plays a vital role in temperature regulation by generating heat. Choice D is incorrect as skeletal muscles may have constant low-level contractions even at rest, known as muscle tone.

3. Which of the heart's four chambers is the largest and the strongest?

• A. Right atrium
• B. Left ventricle
• C. Right ventricle
• D. Left atrium

Correct answer: B

Rationale: The left ventricle is the largest and strongest chamber of the heart. It pumps oxygenated blood to the body, making it vital for systemic circulation. The right atrium receives deoxygenated blood from the body, the right ventricle pumps this blood to the lungs, and the left atrium receives oxygenated blood from the lungs.

4. What is the primary function of hemoglobin in the blood?

• A. Transporting oxygen
• B. Carrying nutrients
• C. Clotting blood
• D. Removing carbon dioxide

Correct answer: A

Rationale: The correct answer is A: Transporting oxygen. Hemoglobin, a protein found in red blood cells, plays a crucial role in transporting oxygen in the blood. It binds to oxygen in the lungs forming oxyhemoglobin and carries it to tissues and organs throughout the body. Once at the destination, hemoglobin releases the oxygen for cellular respiration, providing energy for various physiological processes. Choices B, C, and D are incorrect as hemoglobin's primary function is not carrying nutrients, clotting blood, or removing carbon dioxide. These functions are carried out by other components in the blood such as plasma proteins, platelets, and red blood cells, respectively.

5. What is the primary function of the nervous system?

• A. To transmit signals and coordinate body activities
• B. To fight infections
• C. To produce hormones
• D. To regulate body temperature

Correct answer: A

Rationale: The primary function of the nervous system is to transmit signals and coordinate body activities. It controls and regulates body functions by sending and receiving signals between different parts of the body, enabling responses to internal and external stimuli. This intricate network allows for communication between the brain, spinal cord, and the rest of the body, ultimately facilitating movement, sensation, thoughts, and various bodily functions. Choices B, C, and D are incorrect as they do not represent the primary function of the nervous system. Fighting infections is primarily the role of the immune system, producing hormones is the function of the endocrine system, and regulating body temperature involves mechanisms of thermoregulation within the body, not directly controlled by the nervous system.

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