All of the following statements are true regarding long bones EXCEPT
A.
The diaphysis is composed of compact bone.
B.
The epiphysis consists of spongy bone.
C.
Most bones of the axial skeleton are of this type.
D.
The central shaft encases the medullary canal
Correct Answer: C
Explanation:
Yes, C. Most bones of the axial skeleton are of this type. is the correct answer because it is the false statement (the EXCEPT). Explanation The question asks for the statement that is NOT true about long bones. Option Analysis A. The diaphysis is composed of compact bone. ✅ True The diaphysis is the shaft of a long bone. It is primarily made of compact (cortical) bone, providing strength. B. The epiphysis consists of spongy bone. ✅ True The epiphyses are the ends of long bones. They consist mainly of spongy (cancellous) bone covered by a thin layer of compact bone. C. Most bones of the axial skeleton are of this type. ❌ False (Correct Answer) The axial skeleton includes the skull, vertebral column, ribs, and sternum. Most of these are flat, irregular, or sesamoid bones, not long bones. Long bones are found mainly in the appendicular skeleton (arms and legs), such as the femur, humerus, tibia, and radius. D. The central shaft encases the medullary canal. ✅ True The diaphysis (central shaft) surrounds the medullary cavity (medullary canal), which contains bone marrow. Exam Tip Long Bone Structure Diaphysis = Shaft = Compact bone Epiphysis = Ends = Spongy bone Medullary cavity = Inside the shaft Long bones = Mainly in the appendicular skeleton ✅ Correct Answer: C. Most bones of the axial skeleton are of this type.
Question #2 (Topic: demo questions)
In the organization of skeletal muscle, the muscle cell contains the contractile proteins.
Which of the following is a contractile protein?
A.
Myosin.
B.
Muscle fascicle.
C.
Myofibril.
D.
Muscle fiber.
Correct Answer: A
Explanation:
The question asks which option is a contractile protein found in skeletal muscle. The two primary contractile proteins are: Myosin (thick filament) Actin (thin filament) These proteins interact to produce muscle contraction. Option Analysis A. Myosin ✅ Correct Myosin is a contractile protein. It forms the thick filaments in muscle fibers and interacts with actin to generate force during muscle contraction. B. Muscle fascicle ❌ A fascicle is a bundle of muscle fibers, not a protein. C. Myofibril ❌ A myofibril is a rod-like structure inside a muscle fiber. It contains the contractile proteins (actin and myosin), but it is not itself a protein. D. Muscle fiber ❌ A muscle fiber is a muscle cell, not a contractile protein. Muscle Organization (largest to smallest) Muscle Fascicle Muscle fiber (cell) Myofibril Sarcomere Actin & Myosin (contractile proteins) Exam Tip Remember: Actin = Thin filament Myosin = Thick filament Both are contractile proteins responsible for muscle contraction. ✅ Correct Answer: A. Myosin.
Question #3 (Topic: demo questions)
In the organization of skeletal muscle, the muscle cell contains the contractile proteins.
Which of the following is a contractile protein?
A.
Myosin.
B.
Muscle fascicle.
C.
Myofibril.
D.
Muscle fiber.
Correct Answer: A
Explanation:
The question asks which option is a contractile protein found in skeletal muscle. The two primary contractile proteins are: Myosin (thick filament) Actin (thin filament) These proteins interact to produce muscle contraction. Option Analysis A. Myosin ✅ Correct Myosin is a contractile protein. It forms the thick filaments in muscle fibers and interacts with actin to generate force during muscle contraction. B. Muscle fascicle ❌ A fascicle is a bundle of muscle fibers, not a protein. C. Myofibril ❌ A myofibril is a rod-like structure inside a muscle fiber. It contains the contractile proteins (actin and myosin), but it is not itself a protein. D. Muscle fiber ❌ A muscle fiber is a muscle cell, not a contractile protein. Muscle Organization (largest to smallest) Muscle Fascicle Muscle fiber (cell) Myofibril Sarcomere Actin & Myosin (contractile proteins) Exam Tip Remember: Actin = Thin filament Myosin = Thick filament Both are contractile proteins responsible for muscle contraction. ✅ Correct Answer: A. Myosin.
Question #4 (Topic: demo questions)
Functions of bone include all of the following EXCEPT
A.
Support for the body.
B.
Protection of organs and tissues.
C.
Production of red blood cells.
D.
Production of force.
Correct Answer: D
Explanation:
The question asks for the statement that is NOT a function of bone (EXCEPT). Bones have several important functions, but they do not produce force. Muscles are responsible for generating force, while bones act as levers that muscles pull on to create movement. Option Analysis A. Support for the body. ✅ True Bones provide the body's structural framework and support posture. B. Protection of organs and tissues. ✅ True Examples: Skull protects the brain. Rib cage protects the heart and lungs. Vertebrae protect the spinal cord. C. Production of red blood cells. ✅ True Red blood cells are produced in the red bone marrow, a process called hematopoiesis. D. Production of force. ❌ False (Correct Answer) Bones do not generate force. Force is produced by skeletal muscles during contraction. Bones simply transmit that force and function as levers. Exam Tip Functions of Bone (remember: SPMMS) ✅ S – Support ✅ P – Protection ✅ M – Mineral storage (calcium & phosphorus) ✅ M – Marrow (blood cell production) ✅ S – Support for movement (acts as levers) ❌ Force production is a function of muscles, not bones. ✅ Correct Answer: D. Production of force.
Question #5 (Topic: demo questions)
The C-shaped cartilages of the trachea allow all of the following to occur EXCEPT
A.
Ciliated movement of mucus-secreting cells.
B.
Distention of the esophagus.
C.
Maintenance of open airway.
D.
Prevention of tracheal collapse during pres- sure changes.
Correct Answer: A
Explanation:
The C-shaped cartilages of the trachea primarily provide structural support by keeping the airway open (preventing tracheal collapse) during breathing and pressure changes, while their open posterior side allows the esophagus to expand (distend) during swallowing. However, they do not function in moving mucus. The ciliated epithelial cells lining the trachea are responsible for sweeping mucus and trapped particles upward toward the throat (the mucociliary escalator), independent of the cartilage. Therefore, A is the exception, because ciliated movement is a function of the tracheal lining, not the C-shaped cartilages.