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TLS Online TPP Program

#Question id: 16953

The ability of any stem cell to self-renew and differentiate depends on the structural organization and cellular function of specialized anatomic microenvironments known as stem cell niches. These sequestered regions are typically populated by a supportive network of stromal cells. Stem cell niche stromal cells express soluble and membrane-bound proteins that regulate cell survival, proliferation, differentiation, and trafficking. Which statements is true about HSCs?

#Unit 4. Cell Communication and Cell Signaling
  1. HSCs are not found in blood
  2. The organs that have microenvironments that support the differentiation of hematopoietic stem cells actually change over the course of embryonic development.
  3. Hematopoietic stem cells actually do not change over the course of embryonic development.
  4. HSCs do not take up residence in the bone marrow, which remains the primary site of hematopoiesis throughout adult life
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TLS Online TPP Program

#Question id: 18589

#Unit 7. System Physiology – Animal

Effective way(s) to control and redirect anger include(s) which of the following?
TLS Online TPP Program

#Question id: 21240

#Unit 7. System Physiology – Animal

A visual exam in an 80-year-old man shows he has a reduced ability to see objects in the upper and lower quadrants of the left visual fields of both eyes but some vision remains in the central regions of the visual field. The diagnosis is
TLS Online TPP Program

#Question id: 21241

#Unit 7. System Physiology – Animal

A 45-year-old female who had never needed to wear glasses experienced difficulty reading a menu in a dimly-lit restaurant. She then recalled that as of late she needed to have the newspaper closer to her eyes in order to read it. A friend recommended she purchase reading glasses. Visual accommodation involves
TLS Online TPP Program

#Question id: 21242

#Unit 7. System Physiology – Animal

A 28-year-old male with severe myopia made an appointment to see his ophthalmologist when he began to notice flashing lights and floaters in his visual fi eld. He was diagnosed with a retinal detachment. The retina
TLS Online TPP Program

#Question id: 21243

#Unit 7. System Physiology – Animal

A 62-year-old Caucasian woman experienced a rapid onset of blurry vision along with loss of central vision. A comprehensive eye exam showed that she had wet age-related macular degeneration. The fovea of the eye
TLS Online TPP Program

#Question id: 21244

#Unit 7. System Physiology – Animal

Which of the following parts of the eye has the greatest concentration of rods?