What are the three types of salivary glands and where are they located in the mouth?
Parotid, sublingual, and submandibular glands located in the cheeks, tongue, and roof of the mouth, respectively.
Sublingual, submandibular, and buccal glands located in the tongue, cheeks, and lips, respectively.
Parotid, sublingual, and submandibular glands located in the roof of the mouth, cheeks, and under the jawbone, respectively.
Sublingual, parotid, and buccal glands located in the tongue, cheeks, and lips, respectively.
Correct Answer : C
The three major pairs of salivary glands are the parod glands, sublingual glands, and submandibular glands. The parotid glands are located just in front of your ears. The sublingual glands are below either side of your tongue, under the floor of your mouth. The submandibular glands are located below your jaw ¹.
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Related Questions
Correct Answer is D
Explanation
- A. Nanolitres (nL) → Extremely small unit (1 nL = 0.000000001 L), used for microscopic measurements. ❌
- B. Microlitres (µL) → Also very small (1 µL = 0.000001 L), used in lab settings. ❌
- C. Litres (L) → Too large, as typical urine output per hour is much less than 1 L. ❌
- D. Millilitres (mL) → Suitable, since normal urine output per hour is about 30-80 mL. ✅
Correct Answer is C
Explanation
One of the main funcons of the respiratory system is to facilitate the exchange of gases between the body and the environment. During inhalaon, air enters the lungs and oxygen is absorbed into the bloodstream. During exhalaon, carbon dioxide is removed from the body and expelled into the environment.
Correct Answer is B
Explanation
The epididymis is a coiled tube located at the back of each testicle where the sperm mature and are stored until ejaculation. Sperm are produced in the testes and then transported to the epididymis where they undergo maturation and become motile. The epididymis provides a protective environment for the sperm, allowing them to mature and become more resilient to external stressors. During ejaculation, the sperm are transported from the epididymis to the vas deferens and then to the urethra for ejaculation.
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Correct Answer is D
Explanation
When measuring liquid volume in a graduated measuring cup, you should always read the measurement at the bottom of the meniscus (the lowest point of the curved surface).
Given Information:
- The top of the liquid aligns with the 50 mL mark.
- The bottom of the meniscus aligns with the 40 mL mark.
Since the correct measurement is taken from the bottom of the meniscus, the volume of the liquid is 40 mL.
Correct Answer is A
Explanation
Insulin is a hormone produced by the pancreas that plays a crucial role in regulating the levels of glucose (sugar) in the blood. After a person eats a meal, the levels of glucose in the blood rise, which stimulates the pancreas to release insulin into the bloodstream. Insulin acts on various cells in the body, particularly those in the liver, muscles, and adipose tissue, to promote the uptake, use, and storage of glucose.
Insulin helps to lower the levels of glucose in the blood by increasing the uptake of glucose by cells, stimulating the liver and muscle cells to store glucose in the form of glycogen, and inhibiting the production and release of glucose by the liver. This process is known as glucose homeostasis, and it helps to keep the levels of glucose in the blood within a normal range.
Deficiencies or abnormalities in insulin production or function can lead to a range of metabolic disorders, including type 1 and type 2 diabetes. In type 1 diabetes, the body does not produce enough insulin, while in type 2 diabetes, the body becomes resistant to the effects of insulin, leading to elevated levels of glucose in the blood.
Correct Answer is A
Explanation
The diaphragm is a dome-shaped muscle that plays a key role in breathing. It separates the thoracic cavity, which contains the heart and lungs, from the abdominal cavity. When the diaphragm contracts, it moves downward and increases the volume of the thoracic cavity, allowing air to flow into the lungs. When it relaxes, it moves upward and decreases the volume of the thoracic cavity, forcing air out of the lungs.
Correct Answer is D
Explanation
In the diagram, the circular molecules represent sugar. The square molecules represent hormones that regulate blood sugar levels. Among the answer choices:
- Insulin (A): Lowers blood sugar by promoting glucose uptake in cells.
- Norepinephrine (B): Involved in the fight-or-flight response, not directly related to blood sugar regulation.
- Calcitonin (C): Regulates calcium levels, not glucose.
- Glucagon (D): Raises blood sugar by promoting glucose release from the liver.
Since the diagram involves sugar regulation and the square molecules are coming from the liver, the square molecules represent glucagon hormones.
Correct Answer is B
Explanation
Isotonic and isometric contractions are two types of muscle contractions that differ in the amount of force produced and the movement of the muscle. In isotonic contractions, the muscle changes length and produces movement, such as lifting a weight. The force generated by the muscle remains constant throughout the movement. Isotonic contractions can be further classified as concentric contractions, in which the muscle shortens as it contracts, and eccentric contractions, in which the muscle lengthens as it contracts.
In contrast, isometric contractions occur when the muscle generates force without changing its length or producing movement. For example, holding a weight in a fixed position without moving it requires an isometric contraction. In an isometric contraction, the force generated by the muscle increases up to a maximum and then remains constant. Isometric contractions can be used to build strength and endurance in the muscle, but they do not produce movement.
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Correct Answer is B
Explanation
- A. Sarcoplasmic Reticulum → A specialized endoplasmic reticulum in muscle cells that stores and releases calcium for muscle contraction. ❌
- B. Muscle Fiber → Another name for a muscle cell, which is a long, cylindrical, multinucleated cell that makes up muscle tissue. ✅
- C. Sarcolemma → The cell membrane of a muscle fiber, which surrounds the muscle cell. ❌
- D. Myofilament → Protein structures (actin and myosin) within a muscle fiber that are responsible for contraction. ❌
Correct Answer is C
Explanation
- The number of protons in an atom is equal to its atomic number.
- The periodic table shows that phosphorus (P) has an atomic number of 15.
- This means every phosphorus atom has 15 protons in its nucleus.
Analysis of Other Options:
- A. 30 → This is close to the atomic mass (30.97), but the atomic mass is not the same as the number of protons. ❌
- B. 16 → This is incorrect; sulfur (S) has an atomic number of 16, not phosphorus. ❌
- D. 31 → This is rounded from the atomic mass (30.97), but atomic mass ≠ number of protons. ❌
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