Nursing practice questions with comprehensive rationales
NurseDive Free Nursing Practice Question
Which of the following surrounds the individual muscle cell?
A. perimysium
Perimysium surrounds bundles of muscle fibers known as fascicles, not individual muscle cells. It provides structural support and carries blood vessels and nerves.
B. epimysium
Epimysium is the outermost layer of connective tissue that surrounds the entire muscle. It does not envelop individual muscle cells.
C. endomysium
Endomysium is the correct answer. It is a thin layer of connective tissue that surrounds each individual muscle fiber (cell), providing structural integrity and facilitating capillary exchange.
D. myofibril
Myofibrils are intracellular structures within muscle cells that contain the contractile proteins actin and myosin. They are not connective tissue and do not surround muscle cells.
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: Perimysium surrounds bundles of muscle fibers known as fascicles, not individual muscle cells. It provides structural support and carries blood vessels and nerves.
Choice B reason: Epimysium is the outermost layer of connective tissue that surrounds the entire muscle. It does not envelop individual muscle cells.
Choice C reason: Endomysium is the correct answer. It is a thin layer of connective tissue that surrounds each individual muscle fiber (cell), providing structural integrity and facilitating capillary exchange.
Choice D reason: Myofibrils are intracellular structures within muscle cells that contain the contractile proteins actin and myosin. They are not connective tissue and do not surround muscle cells.
Similar Questions
A bundle of muscle fibers is a(n):
A. myofilament
Myofilaments are the smallest contractile units within myofibrils, composed of actin and myosin. They do not represent bundles of muscle fibers.
B. fascicle
Fascicle is the correct term for a bundle of muscle fibers. Each fascicle is surrounded by perimysium and contains multiple muscle cells.
C. myofibril
Myofibrils are microscopic structures within individual muscle cells that contain the contractile machinery. They are not bundles of muscle fibers.
D. whole muscle
Whole muscle refers to the entire organ composed of multiple fascicles, connective tissues, blood vessels, and nerves. It is a larger structure than a bundle of muscle fibers.
Full Explanation
Choice A reason: Myofilaments are the smallest contractile units within myofibrils, composed of actin and myosin. They do not represent bundles of muscle fibers.
Choice B reason: Fascicle is the correct term for a bundle of muscle fibers. Each fascicle is surrounded by perimysium and contains multiple muscle cells.
Choice C reason: Myofibrils are microscopic structures within individual muscle cells that contain the contractile machinery. They are not bundles of muscle fibers.
Choice D reason: Whole muscle refers to the entire organ composed of multiple fascicles, connective tissues, blood vessels, and nerves. It is a larger structure than a bundle of muscle fibers.
Emily is examining a bone that is 3 inches long and 1 inch wide. Choose the correct classification.
A. flat
Flat bones are typically thin and broad, such as the sternum or skull bones. They do not match the described dimensions of Emily’s bone.
B. irregular
Irregular bones have complex shapes that do not fit into other categories, such as vertebrae. The bone described is not irregular.
C. short
Short bones are roughly cube-shaped and found in areas like the wrist and ankle. A bone that is 3 inches long does not fit this category.
D. long
Long bones are characterized by being longer than they are wide, typically found in the limbs. A bone that is 3 inches long and 1 inch wide fits this classification.
E. sesamoid
esamoid bones are small, round bones embedded in tendons, like the patella. The described bone does not fit this category
Full Explanation
Choice A reason: Flat bones are typically thin and broad, such as the sternum or skull bones. They do not match the described dimensions of Emily’s bone.
Choice B reason: Irregular bones have complex shapes that do not fit into other categories, such as vertebrae. The bone described is not irregular.
Choice C reason: Short bones are roughly cube-shaped and found in areas like the wrist and ankle. A bone that is 3 inches long does not fit this category.
Choice D reason: Long bones are characterized by being longer than they are wide, typically found in the limbs. A bone that is 3 inches long and 1 inch wide fits this classification.
Choice E reason: Sesamoid bones are small, round bones embedded in tendons, like the patella. The described bone does not fit this category
_____ are the most movable joints.
A. symphyses
Symphyses are cartilaginous joints where bones are joined by fibrocartilage. They allow limited movement, such as in the pubic symphysis, but are not the most movable joints.
B. synovial joints
Synovial joints are the most movable type of joints in the human body. They feature a joint cavity filled with synovial fluid, articular cartilage, and a fibrous capsule, allowing for a wide range of motion. Examples include the shoulder, hip, and knee joints.
C. syndesmoses
Syndesmoses are fibrous joints where bones are connected by ligaments or interosseous membranes. They allow more movement than sutures but are still relatively limited compared to synovial joints.
D. gomphoses
Gomphoses are immovable joints found between teeth and their sockets. These joints are highly stable but do not permit movement.
Full Explanation
Choice A reason: Symphyses are cartilaginous joints where bones are joined by fibrocartilage. They allow limited movement, such as in the pubic symphysis, but are not the most movable joints.
Choice B reason: Synovial joints are the most movable type of joints in the human body. They feature a joint cavity filled with synovial fluid, articular cartilage, and a fibrous capsule, allowing for a wide range of motion. Examples include the shoulder, hip, and knee joints.
Choice C reason: Syndesmoses are fibrous joints where bones are connected by ligaments or interosseous membranes. They allow more movement than sutures but are still relatively limited compared to synovial joints.
Choice D reason: Gomphoses are immovable joints found between teeth and their sockets. These joints are highly stable but do not permit movement.