––STRATIFIED SQUAMOUS EPITHELIUM––

Stratified squamous epithelia are multi-layered tissues composed of squamous cells resting on a basement membrane, with underlying layers possibly consisting of cuboidal or columnar cells. These tissues serve as protective barriers against mechanical and chemical stress, found in areas exposed to the external environment or subject to abrasion. They can be keratinized, providing waterproofing and protection against desiccation, as seen in the skin and oral cavity, or non-keratinized, producing mucus for lubrication and protection in areas like the esophagus. Organs like the anus may contain both types, with varying levels of keratin deposition influenced by factors like tobacco or alcohol abuse. Keratinized tissue development involves cell differentiation, leading to cell death and shedding of outer layers. Stratified squamous epithelia are found in various organ systems, including the skin, digestive tract, female reproductive system, respiratory system, eyes, and urethra, serving crucial protective functions throughout the body (Biology Dictionary, 2017).

––SKELETAL MUSCLE––

According to Cleveland Clinic (2021), skeletal muscles, comprising 30 to 40% of total body mass, are integral to performing a diverse array of movements and functions, connecting to bones and functioning under voluntary control. They are the predominant muscle type in the body, with tendons attaching them to bones throughout.

Serving essential roles within the musculoskeletal system, skeletal muscles facilitate processes such as digestion initiation, breathing regulation, posture maintenance, bone movement, and joint protection. These muscles, distributed throughout the body between bones, consist of flexible muscle fibers, varying in diameter and spanning the muscle length, enabling contraction for movement. Each muscle contains thousands of fibers surrounded by different sheaths, including the epimysium, perimysium, and endomysium. Skeletal muscle fibers exhibit a striated appearance due to their composition, distinguishing them from smooth muscles.

While skeletal muscle mass typically constitutes around 35% of body weight, this proportion varies between individuals based on factors such as gender, height, weight, and age, with men generally possessing higher muscle mass than women and muscle mass decreasing with age.

––ADIPOSE TISSUE––

Adipose tissue, commonly referred to as body fat, constitutes a connective tissue spread throughout the body, residing under the skin (subcutaneous fat), amidst internal organs (visceral fat), and within bone cavities (bone marrow adipose tissue). Its primary roles include energy storage and release, insulation, and regulation of various physiological processes. Recognized as an active organ within the endocrine system, adipose tissue communicates with other organs through hormone signals, influencing functions such as hunger regulation, glucose and cholesterol metabolism, and immune response.

Adipose tissue exists in various depots, including subcutaneous and visceral regions, bone marrow, breast tissue, and around organs like the heart, serving diverse functions across the body. It can be categorized into white and brown adipose tissue, with white adipose tissue being the most abundant type, responsible for energy storage and hormonal regulation, while brown adipose tissue, primarily present in infancy, generates heat through thermogenesis, aiding in temperature regulation and infant survival (Cleveland Clinic, 2022).

––ARTERY––

Arteries are essential for transporting oxygen-rich blood from the heart to all body cells, ensuring the distribution of vital nutrients, oxygen, and hormones. They come in two types: elastic arteries, like the aorta, and muscular arteries, such as the femoral artery. These arteries regulate blood pressure, control blood flow, and supply specific organs with oxygenated blood.

Arteries, distinguished by their tubular structure comprising three layers – the tunica intima, tunica media, and tunica externa – are responsive to signals from the central nervous system, allowing them to adjust the tension of their muscle walls and regulate blood pressure. They specialize in supplying oxygenated blood to specific organs or regions of the body, with coronary arteries nourishing the heart, carotid arteries serving the brain and neck, and femoral arteries delivering blood to the legs. Through their intricate network and active regulation of blood pressure and flow, arteries contribute significantly to the proper functioning of all bodily systems, ensuring optimal health and well-being (Cleveland Clinic, 2022).

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REFERENCES:

—-Biology Dictionary. (2017, April 28). Stratified squamous epithelium. https://biologydictionary.net/stratified-squamous-epithelium/

—-Cleveland Clinic. (2021, September 1). Skeletal muscle. https://my.clevelandclinic.org/health/body/21787-skeletal-muscle

—-Cleveland Clinic. (2022, August 18). Adipose tissue (body fat). https://my.clevelandclinic.org/health/body/24052-adipose-tissue-body-fat

—-Cleveland Clinic. (2022, April 30). Arteries. https://my.clevelandclinic.org/health/body/22896-arteries