https://evolutionnews.org/2019/10/the-three-cardinal-problems-of-biology/ The above article is from Evolutionnews.com and it is written by Granville Sewell. In it he discusses the three “cardinal problems” of biology as described by Jean Rodstead back in 1956. How a living creature grows? How species evolve? How life originated? Answers to these questions are still being sought after and Sewell asks […]

Consists of Cutaneous membrane Epidermis and Dermis Accessory structures Subcutaneous layer Functions of the skin Protection Excretion – sweat and sebum Temperature maintenance – sweating and shivering Nutrient storage – Vitamin D3 synthesis – from the sun Sensory detection – sensations from the outside world Integumentary System Components. Epidermis – composed of layers of keratinocytes […]

Microbiology Lecture 10-17-19 The search for viruses, Louis Pasteur postulated that rabies was caused by a “living thing” smaller than bacteria(1884), he developed the first vaccine for rabies. Ivanovski and Beijerinkck showed a disease in tobacco was caused by a virus (1890s). 1950’s virology was multifaceted discipline, viruses are non-cellular particles with a defintie size, […]

Figure 4.5 Date is 10-16-19 Columnar Epithelial – Pseudo stratified ciliated columnar epithelium , Location – Lining of nasal cavity, trachea, and bronchi, portions of the male reproductive tract. Function : protection and secretion. Stratified Columnar Epithelium (multiple layered column cells. Locations – Small areas of the pharynx, epiglottis, anus, mammary gland, salivary glad ducts […]