ATI TEAS Online Practice Exam A-TEAS: Science Questions and Answers | Latest Version | 2024/2025 | Correct & Verified

ATI TEAS Online Practice Exam A-TEAS: Science Questions and Answers | Latest Version | 2024/2025 | Correct & Verified Which organ is responsible for producing melatonin, a hormone that regulates sleep? A) Hypothalamus B) Pituitary gland C) Pineal gland D) Adrenal gland What part of the cell acts as the powerhouse, generating energy in the form of ATP? A) Ribosome B) Mitochondria C) Golgi apparatus D) Endoplasmic reticulum Which layer of skin contains blood vessels and nerve endings? A) Epidermis B) Dermis 2 C) Subcutaneous layer D) Basal layer How does the body maintain a stable internal environment? A) Through homeostasis B) By cellular respiration C) Via osmosis D) Through photosynthesis Which gland controls the body’s metabolic rate by releasing hormones like thyroxine? A) Thyroid gland B) Adrenal gland C) Pituitary gland D) Pancreas What is the main function of the epiglottis? A) To produce sound B) To facilitate swallowing 3 C) To prevent food from entering the airway D) To filter dust and debris Which part of the brain is primarily responsible for processing emotions? A) Amygdala B) Cerebellum C) Hippocampus D) Medulla What is the role of myelin in the nervous system? A) To insulate nerve fibers and speed up signal transmission B) To produce neurotransmitters C) To store calcium D) To generate electrical impulses Which type of blood vessel has the thickest walls to withstand high pressure? A) Arteries B) Veins 4 C) Capillaries D) Lymph vessels What is the function of villi in the small intestine? A) To increase surface area for nutrient absorption B) To produce digestive enzymes C) To store bile D) To