Which germ layer is the central nervous system components derived from?
A. Mesoderm
B. Ectoderm
C. Endoderm
Answer: B
You might also like to view...
The type of epithelium that is found in the exchange surfaces of the lungs is
A) simple squamous. B) stratified squamous. C) simple cuboidal. D) stratified cuboidal. E) transitional.
Answer the following statements true (T) or false (F)
1. A serous membrane covering the wall of the abdominal cavity is called the visceral peritoneum. 2. Pleurisy is the inflammation of the serous membrane lining the abdominal cavity. 3. Serous membranes line body surfaces opening directly to the exterior. 4. The mucocutaneous junction is the area in which skin and mucous membranes meet. 5. Thick synovial fluid lines the digestive system and protects it from physical and chemical damage.
Answer the following statements true (T) or false (F)
1. The intercalated disks that link the heart cells assist in the efficient conduction of the heart contraction. 2. The sinoatrial node is sometimes called the pacemaker of the heart. 3. The AV node initiates the contraction of the atria. 4. The Purkinje fibers and the bundle of His are involved in the contraction of the ventricles. 5. A patient with a serious heart block may be treated with an artificial pacemaker.
When does an ovum finish meiosis?
A. While in a tertiary follicle B. While in a secondary follicle C. During implantation D. During fertilization E. While in a primary follicle