Nursing practice questions with comprehensive rationales
NurseDive Free Nursing Practice Question
The ______ belongs to the thoracic cage, whereas the ______ belongs to the pectoral girdle.
A. Sternum; clavicle
The sternum is a flat bone located in the center of the chest and forms part of the thoracic cage, which protects vital organs such as the heart and lungs. The clavicle, or collarbone, is part of the pectoral girdle and connects the sternum to the scapula, helping to stabilize the shoulder.
B. Scapula; clavicle
Both the scapula and clavicle are components of the pectoral girdle. This choice does not correctly identify a structure from the thoracic cage.
C. Clavicle; sternum
The clavicle belongs to the pectoral girdle, and the sternum to the thoracic cage. This choice reverses the correct anatomical relationship.
D. Scapula; sternum
The scapula is part of the pectoral girdle, and the sternum is part of the thoracic cage. However, this pairing does not match the structure-to-system relationship asked in the question.
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Full Explanation
Choice A reason: The sternum is a flat bone located in the center of the chest and forms part of the thoracic cage, which protects vital organs such as the heart and lungs. The clavicle, or collarbone, is part of the pectoral girdle and connects the sternum to the scapula, helping to stabilize the shoulder.
Choice B reason: Both the scapula and clavicle are components of the pectoral girdle. This choice does not correctly identify a structure from the thoracic cage.
Choice C reason: The clavicle belongs to the pectoral girdle, and the sternum to the thoracic cage. This choice reverses the correct anatomical relationship.
Choice D reason: The scapula is part of the pectoral girdle, and the sternum is part of the thoracic cage. However, this pairing does not match the structure-to-system relationship asked in the question.
Similar Questions
The central canal that runs through the core of each osteon contains:
A. Blood vessels and nerve fibers
The central canal, also known as the Haversian canal, is located at the center of each osteon in compact bone. It contains blood vessels and nerve fibers that supply nutrients and signals to the bone cells.
B. Adipose tissue and nerve fibers
Adipose tissue is found in yellow marrow, primarily in the medullary cavity of long bones, not in the central canal of osteons.
C. Yellow marrow and spicules
Yellow marrow and spicules are found in the medullary cavity and spongy bone, respectively. They are not components of the central canal.
D. Cartilage and interstitial lamellae
Cartilage is not present in the central canal. Interstitial lamellae are layers of bone matrix found between osteons, not within the canal.
E. Red marrow and nerves
Red marrow is found in spongy bone and certain flat bones, not in the central canal. While nerves are present, the absence of blood vessels in this choice makes it incomplete.
Full Explanation
Choice A reason: The central canal, also known as the Haversian canal, is located at the center of each osteon in compact bone. It contains blood vessels and nerve fibers that supply nutrients and signals to the bone cells.
Choice B reason: Adipose tissue is found in yellow marrow, primarily in the medullary cavity of long bones, not in the central canal of osteons.
Choice C reason: Yellow marrow and spicules are found in the medullary cavity and spongy bone, respectively. They are not components of the central canal.
Choice D reason: Cartilage is not present in the central canal. Interstitial lamellae are layers of bone matrix found between osteons, not within the canal.
Choice E reason: Red marrow is found in spongy bone and certain flat bones, not in the central canal. While nerves are present, the absence of blood vessels in this choice makes it incomplete.
Pointing the toes downward is an example of:
A. Pronation
Pronation refers to the rotation of the forearm or foot so that the palm or sole faces downward. It does not describe the movement of pointing the toes.
B. Protraction
Protraction is the anterior movement of a body part in the transverse plane, such as pushing the jaw forward. It is unrelated to foot movement.
C. Plantar flexion
Plantar flexion is the movement that increases the angle between the dorsum of the foot and the shin, such as when pointing the toes downward. It is the correct term for this action.
D. Dorsiflexion
Dorsiflexion is the opposite of plantar flexion—it involves raising the toes upward toward the shin, decreasing the angle between the foot and leg.
Full Explanation
Choice A reason: Pronation refers to the rotation of the forearm or foot so that the palm or sole faces downward. It does not describe the movement of pointing the toes.
Choice B reason: Protraction is the anterior movement of a body part in the transverse plane, such as pushing the jaw forward. It is unrelated to foot movement.
Choice C reason: Plantar flexion is the movement that increases the angle between the dorsum of the foot and the shin, such as when pointing the toes downward. It is the correct term for this action.
Choice D reason: Dorsiflexion is the opposite of plantar flexion—it involves raising the toes upward toward the shin, decreasing the angle between the foot and leg.
Muscle tissue has all of the following properties EXCEPT:
A. Elasticity
Elasticity refers to the ability of muscle tissue to return to its original shape after being stretched or contracted. It is a fundamental property of muscle.
B. Extensibility
Extensibility is the ability of muscle to be stretched without being damaged. This allows muscles to accommodate movement and joint flexibility.
C. Excitability
Excitability is the ability of muscle cells to respond to stimuli, typically from the nervous system. This property is essential for initiating contraction.
D. Secretion
Secretion is not a property of muscle tissue. It refers to the release of substances from glands or cells, such as hormones or enzymes, and is not involved in muscle function.
Full Explanation
Choice A reason: Elasticity refers to the ability of muscle tissue to return to its original shape after being stretched or contracted. It is a fundamental property of muscle.
Choice B reason: Extensibility is the ability of muscle to be stretched without being damaged. This allows muscles to accommodate movement and joint flexibility.
Choice C reason: Excitability is the ability of muscle cells to respond to stimuli, typically from the nervous system. This property is essential for initiating contraction.
Choice D reason: Secretion is not a property of muscle tissue. It refers to the release of substances from glands or cells, such as hormones or enzymes, and is not involved in muscle function.