Practice Test

πŸ“ Explanation:

Mcroscopic picture of red blood cells (RBCs) in thalassemia, the following characteristics are typically observed:

1. Microcytic: The RBCs are smaller than normal (microcytic) due to the reduced hemoglobin content.
2. Hypochromic: The RBCs have a lower concentration of hemoglobin, leading to a paler appearance (hypochromic).
3. Target cells: These are RBCs that have a bullseye appearance due to an abnormal distribution of hemoglobin within the cell. Target cells are often seen in thalassemia due to the imbalance of globin chains and the resultant membrane changes.

πŸ“ Explanation:

The correct answer is: 1. Progression ¨ vascularization ¨ invasion ¨ detachment ¨ embolization.

Explanation of the stages for a malignant tumor cell:

1. Progression: This is the initial stage of tumor development where the cells acquire the ability to proliferate in an uncontrolled manner. This can be due to genetic mutations that alter the normal regulatory mechanisms that control cell division. The tumor grows locally within the tissue or organ of origin.

2. Vascularization: Also known as angiogenesis, this stage involves the formation of new blood vessels that supply the tumor with nutrients and oxygen, which is essential for its continued growth and progression. The tumor cells secrete factors that stimulate the growth of blood vessels into the tumor mass.

3. Invasion: The malignant tumor cells develop the capability to invade surrounding tissues. They secrete enzymes that degrade the extracellular matrix and basement membrane, allowing them to move through these barriers and invade neighboring tissues and organs.

4. Detachment: During this stage, tumor cells detach from the primary tumor site. This is facilitated by the loss of cell-to-cell adhesion molecules and the degradation of the extracellular matrix by proteolytic enzymes.

5. Embolization: Detached tumor cells can then enter the lymphatic system or bloodstream. This process is known as intravasation. They travel through these vessels as emboli and can potentially form new tumors at distant sites, which is the process of metastasis.

πŸ“ Explanation:

Sarcoidosis is a systemic granulomatous disorder of unknown etiology that can affect any organ in the body. It is characterized by the formation of non-caseating granulomas, which are clumps of inflammatory cells that cluster together in response to an unidentified antigen. The lungs and lymph nodes are most commonly involved. Here's a detailed explanation for each of the options:

1. Dry cough: This is a common symptom of pulmonary sarcoidosis. The cough is usually persistent and non-productive, meaning it does not bring up mucus or phlegm. The presence of a dry cough is not contradicted in the statement "All are true regarding Sarcoidosis except," so this option is not the correct answer.

2. Exertional dyspnoea: Shortness of breath on exertion can occur in individuals with pulmonary sarcoidosis due to the inflammation and granuloma formation in the lungs. This symptom can be a result of the impaired lung function and decreased lung capacity caused by the disease. Therefore, this is also a true statement regarding sarcoidosis.

3. Wheezing: Wheezing is a high-pitched whistling sound that occurs during breathing, typically heard when airways become narrowed or blocked. It can be a symptom of pulmonary sarcoidosis, particularly if the disease involves the bronchi and bronchioles, leading to bronchial obstruction and airflow limitation. However, it is not the primary symptom and may be less common than the other respiratory symptoms mentioned.

4. Hemoptysis: While hemoptysis, or coughing up blood, is not a hallmark symptom of sarcoidosis, it can occur in some cases, particularly when the granulomas are located in the lungs. It is usually mild and self-limited, but severe cases can lead to significant bleeding. This is a true statement regarding sarcoidosis, as it is a possible, although less common, respiratory symptom of the disease.

Since all the options (1, 2, and 4) are true regarding Sarcoidosis