Medplexus

Instruction: pick the one best answer. This is also useful on the USMLE step 1. 1. Which cell is a also called a septal cell? a. Clara cell b. Type I pneumocyte c. Type II pneumocyte d. Dust cell e. Brush cell Answer: c The Clara cell is found in the terminal bronchioles. The type I pneumocyte is a squamous epithelial cell. It covers most of the surface of the alveoli. The type II pneumocyte is also called a septal cell. The type II pneumocyte secretes surfactant. The dust cell is also called the alveolar phagocyte. Brush cells are occasionally, but rarely, seen in the alveolar epithelium. 2.Which cell is a respiratory macrophage? a. Kupffer cells b. Histiocyte c. Dust cell d. Langerhans cell e. Microglia Answer: c Macrophages are mononuclear phagocytes. Many tissues have resident (fixed) macrophages. Fixed macrophages are given a unique name, depending on the tissue that they are located in. Kupffer cells are the hepatic macrophages. Histiocyte

Instruction: pick the one best answer. This is also useful on the USMLE step 1. 1. Which of the following is composed of loose connective tissue? a. Epidermis b. Reticular layer of dermis c. Hypodermis d. Both a and b e. Both b and c Answer: c The skin is composed of two layers: the epidermis and the dermis. Underneath these layers lies the hypodermis. The epidermis is stratified squamous epithelium. The dermis is composed of a papillary layer and a reticular layer. The reticular layer of the dermis is made up of dense irregular connective tissue. The hypodermis is a layer of loose connective tissue. 2. Where is thick skin found? a. Over the knee b. Sole of the feet c. Breast d. Lips e. All of the above Answer: b 3. Which layer of the epidermis has cells which have keratohyaline granules? a. Stratum basale b. Stratum spinosum c. Stratum granulosum d. Stratum lucidum e. Stratum corneum Answer: c The epidermis is divided into f