Steroid hormones are a class of hormones derived from cholesterol that play crucial roles in regulating a wide range of physiological processes. They include glucocorticoids, mineralocorticoids, and sex steroids. The synthesis of these hormones from cholesterol is a complex process involving multiple enzymatic steps. Biological Significance of Steroid Hormones Steroid hormones exert their effects by…
Cholesterol is a crucial lipid molecule with significant roles in cellular structure, hormone synthesis, and digestion. Its conversion into bile acids is a vital pathway for maintaining cholesterol homeostasis and facilitating the digestion and absorption of dietary fats. Biological Significance of Cholesterol 1. Component of Cell Membranes Membrane Fluidity: Cholesterol is a key component of…
De novo synthesis of fatty acids is a crucial metabolic process in which acetyl-CoA is converted into fatty acids. This process primarily occurs in the cytoplasm of liver cells (hepatocytes), adipose tissue, and mammary glands during lactation. Palmitic acid (C16:0) is the primary product of this pathway and serves as a precursor for other fatty…
Ketone bodies are water-soluble molecules produced by the liver during periods of low carbohydrate intake, prolonged fasting, or intense exercise. They serve as an alternative energy source when glucose is scarce. The primary ketone bodies are acetoacetate, β-hydroxybutyrate, and acetone. This note will provide a detailed overview of the formation and utilization of ketone bodies,…
Lipid metabolism is a complex process involving the breakdown, synthesis, and regulation of fats within the body. One of the key processes in lipid metabolism is β-oxidation, a catabolic pathway by which fatty acid molecules are broken down in the mitochondria to generate acetyl-CoA, NADH, and FADH2. This note will provide a detailed overview of…
मोटापे से है परेशान मोटापे से है परेशान ऑर्लिस्टैट एक वजन घटाने की दवा है जो शरीर में फैट (वसा) के अवशोषण को कम करती है। यह उन लोगों के लिए उपयुक्त है जिन्हें मोटापा (obesity) की समस्या है और जो व्यायाम और डाइट कंट्रोल से वजन नहीं घटा पा रहे हैं। आइए जानते हैं…
Eczema, also known as atopic dermatitis (AD), is a chronic, inflammatory skin condition characterized by itchy, red, and dry skin. It commonly begins in childhood and can persist into adulthood, with periods of exacerbation and remission. Eczema is a multifactorial disease influenced by genetic, environmental, and immunological factors. Etiopathogenesis of Eczema The etiopathogenesis of eczema…
Scabies is a highly contagious parasitic infestation of the skin caused by the mite Sarcoptes scabiei var. hominis. It is characterized by intense itching and skin rash, primarily affecting areas with thin skin, such as the interdigital spaces of the fingers, wrists, elbows, axillae, waistline, buttocks, and genitalia. Scabies infestation occurs worldwide and can affect…
Psoriasis is a chronic, immune-mediated inflammatory skin disorder characterized by well-defined, red, scaly plaques. It is a systemic disease with potential involvement of multiple organ systems, primarily affecting the skin and joints. Psoriasis is considered an autoimmune condition in which the immune system mistakenly attacks healthy skin cells, leading to rapid turnover of skin cells…
Osteoarthritis (OA) is the most common form of arthritis and a leading cause of chronic joint pain and disability. It is characterized by the progressive degeneration of articular cartilage within synovial joints, along with changes in the underlying bone and surrounding soft tissues. OA primarily affects weight-bearing joints such as the knees, hips, spine, and…
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