Nursing practice questions with comprehensive rationales
NurseDive Free Nursing Practice Question
The axial skeleton includes:
A. The skull, the scapula, and the vertebral column
The scapula is part of the appendicular skeleton, not the axial skeleton. Therefore, this combination is incorrect.
B. The skull, vertebral column, and pelvis
The pelvis includes both axial and appendicular components, but the pelvic girdle is considered part of the appendicular skeleton. This makes the answer inaccurate.
C. Pectoral girdle, pelvic girdle, and vertebral column
Both the pectoral and pelvic girdles are part of the appendicular skeleton. Including them in the axial skeleton is incorrect.
D. Arms, legs, hands, and feet
Arms, legs, hands, and feet are all part of the appendicular skeleton. They are not included in the axial skeleton.
E. The skull, vertebral column, and rib cage
This is the correct answer. The axial skeleton consists of the skull, vertebral column, and rib cage. These structures form the central axis of the body and protect vital organs such as the brain, spinal cord, and thoracic organs.
This question is an excerpt from Nurse Dive's nursing test bank - Anatomy and physiology proctored exam. Take the full exam now
Full Explanation
Choice A reason: The scapula is part of the appendicular skeleton, not the axial skeleton. Therefore, this combination is incorrect.
Choice B reason: The pelvis includes both axial and appendicular components, but the pelvic girdle is considered part of the appendicular skeleton. This makes the answer inaccurate.
Choice C reason: Both the pectoral and pelvic girdles are part of the appendicular skeleton. Including them in the axial skeleton is incorrect.
Choice D reason: Arms, legs, hands, and feet are all part of the appendicular skeleton. They are not included in the axial skeleton.
Choice E reason: This is the correct answer. The axial skeleton consists of the skull, vertebral column, and rib cage. These structures form the central axis of the body and protect vital organs such as the brain, spinal cord, and thoracic organs.
Similar Questions
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.
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.
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.