Which Of The Following Tissues Is The Most Highly Radiosensitive?

Which position indicating device is most effective in reducing patient exposure?

16 Cards in this SetEvery patient should be evaluated individually for dental radiographs.

T/FTrueWhich of the following position -indicating devices is most effective in reducing patient exposure?Rectangular PIDWhich of the following devices restricts the size and shape of the x-ray beam?Collimator13 more rows.

Why are rapidly dividing cells more sensitive to radiation?

Tissues that are made up of rapidly dividing cells are similarly radiation-sensitive. … Cells that are fully oxygenated tend to be more sensitive than those that are less well-oxygenated. The reasons for this will be discussed later in the lecture.

What organs are affected by radiation?

Let’s do a head-to-toe walk-through to investigate how high doses of radiation can damage the human body.Brain. Nerve cells (neurons) and brain blood vessels can die, leading to seizures.Eyes. Radiation exposure increases the risk of cataracts.Thyroid. … Lungs. … Heart. … GI tract. … Reproductive organs. … Skin.More items…•

Which of the following is most radioresistant?

Cell sensitivity Cells that do not normally divide but have the potential for division, such as parenchymal liver cells are relatively radioresistant. Non‐dividing cell lines such as muscle cells, nerve cells, mature erythrocytes, and spermatozoa are the most radioresistant.

What is defined as the time that elapses between exposure to ionizing radiation and the appearance of observable clinical signs?

Latent Period. defined as the time that elapses between exposure to ionizing radiation and the appearance of observable clinical signs. Period of Injury. variety of cellular injuries that may result after the latent period.

What is the process of cell division of the reproductive genetic cells called?

Meiosis also allows genetic variation through a process of DNA shuffling while the cells are dividing. Mitosis and meiosis, the two types of cell division.

What unit is used to describe ionization in air?

The roentgen (R) unit refers to the amount of ionization present in the air. One roentgen of gamma- or x-ray exposure produces approximately 1 rad (0.01 gray) tissue dose (see next section for definitions of gray (Gy) and rad units of dose).

What is the SI unit of exposure that measures radiation in air?

It is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air. … The SI unit of exposure is the coulomb per kilogram (C/kg), which has largely replaced the roentgen (R).

Which of the following types of cells is most radiosensitive?

G1 is the most time variable of cell phases. human cells are most radiosensitive in M and most radioresistent in late S. irradiation of mammalian cells with high-LET radiation follows the single-target, single-hit model. Human cells are divided into two classifications.

Which radiation unit is determined by the quality factor?

The SI unit is the sievert (SV), but the rem is commonly used. Rem is an acronym for “roentgen equivalent in man.” One rem is equivalent to 0.01 SV. When exposed to X- or Gamma radiation, the quality factor is 1. Dose Rate: The dose rate is a measure of how fast a radiation dose is being received.

Which part of the cell cycle is most sensitive to radiation?

Cells in late G2 and mitosis (M-phase) are the most sensitive to radiation, and cells in late synthesis (S-phase) are the most resistant (Fig.

What is the most radioresistant tissue?

The cells in the bone marrow are undifferentiated, well nourished, dividing quickly and highly active metabolically and hence are the most radiosensitive cells of the body.

What is a somatic effect?

Somatic effects are those which occur in the exposed individual. Genetic effects may affect subsequent unexposed generations; somatic effects are limited to the exposed individual.

What is the most radiosensitive organ in the body?

The digestive tract is among the most radiosensitive organs in the body and its function, which is partly regulated by gastrointestinal (GI) peptides, can be affected by radiation exposure. However, very little is known about the effect of whole-body radiation on blood GI peptides.

What types of cells are most sensitive to radiation damage quizlet?

Cells that divide very rapidly (spermatozoa and lymphocytes) are extremely sensitive to radiation because they are in the metaphase stage of mitosis more often.