Practice Science TEAS Test

Correct Answer: B

Rationale: The correct answer is B: Smooth muscles. Smooth muscles are found in the walls of hollow organs like the stomach, intestines, and blood vessels. They are involuntary muscles responsible for the contraction and relaxation of these organs to facilitate processes like digestion and blood flow. Cardiac muscles (choice A) are found in the heart, skeletal muscles (choice C) are attached to bones for movement, and voluntary muscles (choice D) refer to muscles under conscious control, which can be either skeletal or cardiac but not typically found in the walls of hollow organs.

Correct Answer: B

Rationale: The correct answer is B: To provide structural support. The skeletal system functions to support the body, protect internal organs, allow movement, and produce blood cells. Structural support is a primary function as bones form the framework of the body. Red blood cell production occurs in the bone marrow, not the skeletal system directly (A). Nutrient transport primarily involves the circulatory system, not the skeletal system (C). Fat storage is not a function of the skeletal system; it is mainly stored in adipose tissue (D). In summary, the skeletal system's main function is to provide structural support for the body.

Correct Answer: B

Rationale: The correct answer is B: Vein. Veins carry blood back to the heart, while arteries carry blood away from the heart. Capillaries are tiny blood vessels where exchange of nutrients and waste occurs. Lymphatic vessels carry lymph fluid, not blood. Veins have valves to prevent backflow and low pressure due to distance from the heart.

Correct Answer: B

Rationale: The correct answer is B: Cartilage. Cartilage is the type of tissue that protects the respiratory system's trachea. Cartilage provides structural support and flexibility to the trachea, allowing it to maintain its shape and prevent collapse during breathing. Bone (A) is too rigid for this function. Collagen (C) is a protein that provides strength but does not have the same supportive properties as cartilage. Keratin (D) is a protein found in skin, hair, and nails, not in the trachea. Therefore, cartilage is the most suitable tissue to protect the trachea in the respiratory system.

Correct Answer: A

Rationale: The correct answer is A: Ionic bond. In KCl, potassium (K) is a metal and chlorine (Cl) is a nonmetal. Ionic bonds form between a metal and a nonmetal through the transfer of electrons. In KCl, potassium donates an electron to chlorine, resulting in the formation of K+ and Cl- ions, which are held together by electrostatic forces. Covalent bonds (choice B) involve the sharing of electrons between two nonmetals, which is not the case in KCl. Hydrogen bonds (choice C) occur between molecules with hydrogen and electronegative atoms like oxygen or nitrogen, not between ionic compounds. Polar covalent bonds (choice D) involve unequal sharing of electrons between nonmetals, which is not the case in KCl where there is a complete transfer of electrons.