Nokea
Which part of the brain is most posterior?
- A. Frontal lobe
- B. Parietal lobe
- C. Temporal lobe
- D. Occipital lobe
Correct Answer: D
Rationale: The occipital lobe is located at the most posterior part of the brain, towards the back of the head. It is primarily responsible for processing visual information from the eyes and plays a crucial role in vision-related functions. The frontal lobe (Choice A) is located at the front of the brain and is responsible for functions such as reasoning and planning. The parietal lobe (Choice B) is located in the middle part of the brain and plays a role in sensory information processing. The temporal lobe (Choice C) is located on the sides of the brain and is involved in processing auditory information and memory. Therefore, the occipital lobe (Choice D) is the correct answer as it is the most posterior region of the brain.
You may also like to solve these questions
The vena cavae drain blood from the body into the ___________.
- A. right atrium
- B. right ventricle
- C. left atrium
- D. left ventricle
Correct Answer: A
Rationale: The vena cavae are large veins responsible for returning deoxygenated blood from the body to the heart. They empty into the right atrium of the heart. From the right atrium, the blood is then pumped into the right ventricle before being sent to the pulmonary circulation for oxygenation, making choice A, 'right atrium,' the correct answer. Choices B, C, and D are incorrect because the vena cavae do not empty into the ventricles of the heart; instead, they deliver blood to the atria.
How do the intercostal muscles between the ribs assist with respiration?
- A. By protecting the delicate bronchioles and alveoli
- B. By signaling a decrease in intra-alveolar pressure
- C. By enlarging and reducing the space in the thorax
- D. By maintaining a medial separation between pleurae
Correct Answer: C
Rationale: The intercostal muscles located between the ribs play a crucial role in respiration by aiding in the enlargement and reduction of the space in the thorax. During inspiration, these muscles contract, lifting the rib cage, which increases the volume of the thoracic cavity and allows the lungs to expand and fill with air. This process directly relates to the expansion of the thorax rather than protecting bronchioles and alveoli (Choice A), signaling intra-alveolar pressure changes (Choice B), or maintaining the separation between pleurae (Choice D). Therefore, the correct answer is C.
Which might be a result of stenosis, or narrowing of a heart valve?
- A. Abdominal pain
- B. Blood clots
- C. Edema (swelling) in organs
- D. Irregular heartbeat
Correct Answer: D
Rationale: Stenosis, or narrowing of a heart valve, restricts blood flow through the valve, leading to changes in the heart's normal rhythm. This alteration can result in an irregular heartbeat, making it a common consequence of heart valve stenosis. Abdominal pain, blood clots, and organ swelling are not typically associated with stenosis of a heart valve.
Through which organ do muscles push food into the stomach via peristalsis?
- A. Mouth
- B. Small intestine
- C. Epiglottis
- D. Esophagus
Correct Answer: D
Rationale: The correct answer is D, Esophagus. Muscles push food into the stomach via peristalsis in the esophagus. Peristalsis is a coordinated muscular contraction that helps move food from the mouth to the stomach through the esophagus. The rhythmic contractions of the esophageal muscles create a wave-like motion that propels food downward toward the stomach for digestion. Choices A, B, and C are incorrect because the mouth is where digestion begins but does not push food into the stomach, the small intestine is mainly responsible for absorbing nutrients, and the epiglottis is a flap that prevents food from entering the trachea during swallowing, not involved in pushing food into the stomach.
The spleen is part of which system?
- A. nervous system
- B. integumentary system
- C. lymphatic system
- D. urinary system
Correct Answer: C
Rationale: The correct answer is C: lymphatic system. The spleen is a vital organ in the lymphatic system, responsible for filtering blood, producing and storing white blood cells, and aiding the body in fighting infections. The lymphatic system is crucial for maintaining the body's immune defenses and fluid balance. Choices A, B, and D are incorrect because the spleen is not part of the nervous system, integumentary system, or urinary system.