What are phalanges?
Forearm bones
Wrist and ankle bones
Finger and toe bones
Upper arm bones
The Correct Answer is C
The human skeleton is divided into axial and appendicular components, with the appendicular skeleton forming the limbs and their associated structures. The bones of the hands and feet are specialized for fine motor skills, balance, and locomotion. These distal limb bones are organized into specific groups based on location and function. Phalanges are the most distal bones of the upper and lower limbs and play a key role in dexterity and weight-bearing movements.
A. Forearm bones: The forearm consists of two long bones: the radius and ulna. These bones articulate with the humerus at the elbow and with the carpal bones at the wrist, allowing movements such as pronation and supination. They are not part of the fingers or toes.
B. Wrist and ankle bones: The wrist bones are called carpals, and the ankle bones are called tarsals. These are short bones that provide stability and support while allowing controlled movement of the hands and feet. They serve as transitional structures between the long bones and the digits. Since phalanges are located beyond these structures, this option is incorrect.
C. Finger and toe bones: phalanges are the bones that make up the digits of the hands and feet. Each finger typically has three phalanges (proximal, middle, and distal), except the thumb, which has two. Similarly, toes also contain phalanges arranged in a similar pattern. These bones are essential for fine motor control, grip strength, and balance during walking.
D. Upper arm bones: The upper arm contains a single long bone called the humerus, which extends from the shoulder to the elbow. It plays a major role in arm movement and muscle attachment. However, it is not related to the structure of the fingers or toes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Homeostasis is a fundamental physiological principle that describes how the human body maintains a relatively stable internal environment despite continuous changes in the external environment. This stability is essential for normal cellular function and survival, as enzymes, metabolic processes, and cellular activities operate within narrow optimal ranges. The body achieves homeostasis through coordinated feedback mechanisms involving the nervous and endocrine systems. These regulatory systems continuously monitor and adjust variables such as temperature, blood glucose, pH, and fluid balance.
A. The changing external conditions of the environment: This option describes environmental variability rather than internal regulation. Homeostasis is not about external changes themselves but about the body’s response to those changes. External conditions such as temperature, humidity, or atmospheric pressure may fluctuate, but homeostasis refers specifically to how the internal environment remains stable despite these fluctuations.
B. The maintenance of stable internal conditions: homeostasis refers to the body’s ability to maintain a constant internal environment within narrow physiological limits. This includes regulation of core temperature, blood glucose levels, blood pressure, and electrolyte balance. These processes are controlled through negative feedback mechanisms involving the nervous and endocrine systems. Stability of the internal environment is essential for proper cellular and organ function.
C. The breakdown of nutrients for energy production: This option describes metabolism, specifically catabolism, which involves the chemical breakdown of nutrients to release energy in the form of ATP. While metabolism is essential for life and is regulated in part by homeostatic mechanisms, it is not the definition of homeostasis itself. Therefore, this statement refers to a specific physiological process rather than the overall regulatory balance of the internal environment.
D. The transmission of electrical signals in neurons: This describes neural conduction, which is the process by which neurons transmit electrical impulses through action potentials. It is a key function of the nervous system involved in communication and coordination. However, it does not define the regulation of internal physiological stability.
Correct Answer is B
Explanation
Bone growth occurs through two main processes: appositional growth (increase in thickness) and longitudinal growth (increase in length). Longitudinal bone growth specifically occurs during childhood and adolescence at the epiphyseal (growth) plate, which is a layer of hyaline cartilage located between the epiphysis and diaphysis of long bones. This region allows bones to lengthen through a process of cartilage proliferation, hypertrophy, and eventual ossification. Once the epiphyseal plate closes after puberty, longitudinal growth ceases.
A. Cell division in the medullary cavity: the medullary cavity is primarily involved in fat storage (yellow bone marrow) and does not contribute to longitudinal bone growth. While bone marrow does undergo cellular activity such as hematopoiesis in red marrow, this occurs mainly in flat bones and epiphyses, not for increasing bone length. Therefore, cell division in this region does not drive lengthwise bone growth.
B. Increased activity within the epiphyseal plate: the epiphyseal plate is the site of longitudinal bone growth. Within this cartilage layer, chondrocytes undergo rapid division and enlargement, followed by calcification and replacement with bone tissue by osteoblasts. This process, known as endochondral ossification, progressively lengthens the bone until the growth plate closes after skeletal maturity. Increased activity in this region directly leads to bone elongation.
C. Bone remodeling by osteoclasts in the periosteum: osteoclasts are responsible for bone resorption, not growth in length. The periosteum contributes to appositional growth, which increases bone thickness rather than length. Bone remodeling maintains bone strength and mineral balance but does not result in elongation.
D. Calcium deposition in compact bone: calcium deposition refers to mineralization of bone matrix, which contributes to bone hardness and strength. Compact bone is involved in structural support and is remodeled throughout life, but this process does not increase bone length. Instead, it contributes to bone density and mechanical resistance rather than growth in size.
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