Centrioles are paired barrel-shaped organelles located in the cytoplasm of animal cells near the nuclear envelope. Centrioles play a role in organizing microtubules that serve as the cell’s skeletal system. What is Centriole is it present in plant cell? No. Plant Cells lack centrioles. Centrioles are present only in animalRead More →
The type 2 cells of the alveoli produce surfactant, which reduces surface tension to keep the alveoli open for gas exchange. What does type II alveolar cells do? Four major functions have been attributed to alveolar type II cells: (1) synthesis and secretion of surfactant; (2) xenobiotic metabolism; (3) transepithelialRead More →
Myoepithelial cells are contractile cells associated with the secretory end-pieces. They are branching or stellate-shaped cells with processes containing actin and myosin that embrace the secretory cells (Fig. 2B). What do myoepithelial cells surround? Myoepithelial cells surround the acinar cells and the intercalated ducts and function by contracting and forcingRead More →
Hematocrit is the percentage of red cells in your blood. Normal levels of hematocrit for men range from 41% to 50%. Normal level for women is 36% to 48%. What is hematocrit blood test used for? A hematocrit (HCT) lab test determines the percentage of the blood that is composedRead More →
Currently, there are three distinct wind cells – Hadley Cells, Ferrel Cells, and Polar Cells – that divide the troposphere into regions of essentially closed wind circulations. In this arrangement, heat from the equator generally sinks around 30° latitude where the Hadley Cells end. Where are Hadley cells found? HadleyRead More →
A vacuole is a type of vesicles mostly containing water. Vacuole is a characteristic feature of plant cells, but it can be found in animal cells, bacterial cells, protist and fungal cell as well. It contains organic compounds including enzymes and inorganic compounds other than water. What cells have aRead More →
Filopodia are thin, actin-rich plasma-membrane protrusions that function as antennae for cells to probe their environment. Consequently, filopodia have an important role in cell migration, neurite outgrowth and wound healing and serve as precursors for dendritic spines in neurons. What are filopodia guided by? To define how filopodia help toRead More →
B cell activation occurs in the secondary lymphoid organs (SLOs), such as the spleen and lymph nodes. After B cells mature in the bone marrow, they migrate through the blood to SLOs, which receive a constant supply of antigen through circulating lymph. Where do T cells migrate to for maturation?Read More →
CD4+ T cells in inflamed skin tissue mostly showed a memory phenotype, suggesting that activated, dermal Langerhans cells would restimulate primed CD4+ T cells. Activated dermal Langerhans cells could also be stimulated by T cells via the CD40/CD40 ligand pathway. How do Langerhans cells protect the body? Langerhans cells sendRead More →
A special type of immune cell that is found in tissues, such as the skin, and boosts immune responses by showing antigens on its surface to other cells of the immune system. A dendritic cell is a type of phagocyte and a type of antigen-presenting cell (APC). Which cells areRead More →