The normal systolic blood pressure of a healthy adult is about: MCQ with Answer and Explanation

Explanation:
The epiglottis is a leaf-shaped elastic cartilage that covers the glottis (opening of the larynx) during swallowing, directing food into the esophagus and preventing it from entering the trachea. The thyroid cartilage forms the Adam's apple, the cricoid is ring-shaped below, and arytenoids are involved in vocal cord movement.

Explanation:
The pancreas is a mixed gland; its exocrine part secretes digestive enzymes (trypsin, lipase, amylase), and its endocrine part (Islets of Langerhans) secretes hormones (insulin, glucagon). The liver continuously secretes bile, but bile does not contain digestive enzymes; it contains bile salts that emulsify fats. The gall bladder stores and concentrates this bile before releasing it into the duodenum. Thus, statements 1 and 3 are correct.

Explanation:
Rheumatoid arthritis is a chronic inflammatory autoimmune disease where the immune system mistakenly attacks the body's own healthy tissues, specifically the synovial membranes of joints. This leads to painful swelling, bone erosion, and joint deformity. Other examples of autoimmune diseases include Type 1 diabetes, multiple sclerosis, and systemic lupus erythematosus.