During internal and external respiration, gases move by

Correct Answer: C

Rationale: The correct answer is C: diffusion. During internal and external respiration, gases move from areas of high concentration to low concentration through passive diffusion. This process is driven by the concentration gradient, allowing gases like oxygen and carbon dioxide to exchange in the lungs and tissues. Osmosis (A) is the movement of water across a semipermeable membrane, not gases. Active transport (B) requires energy and moves substances against their concentration gradient, which is not how gases move during respiration. Endocytosis (D) is a process where cells engulf substances by forming vesicles, not how gases are exchanged in respiration.

Correct Answer: A

Rationale: The correct answer is A: Flat. During inspiration, the muscles attached to the diaphragm contract, causing it to flatten. This action increases the volume of the thoracic cavity, allowing air to rush into the lungs. The diaphragm moving downward creates a larger space for the lungs to expand. Choices B, C, and D are incorrect because the diaphragm does not become dome-shaped, concave, or rotate during inspiration. The key concept here is understanding the role of the diaphragm in the breathing process and how its contraction affects the shape of the thoracic cavity.

Correct Answer: B

Rationale: The correct answer is B. Intact skin behind the ears indicates that the oxygen delivery device is fitted properly and not causing skin breakdown, ensuring client safety. A (meals being eaten) is not directly related to oxygen therapy outcomes. C (client understanding) is important but doesn't directly assess client safety with oxygen therapy. D (unchanged weight) is not a specific indicator of client safety with oxygen therapy.

Correct Answer: C

Rationale: The correct answer is C: Try warm, moist heat packs on your face. Warm, moist heat can help relieve facial pain and sinus pressure by promoting sinus drainage and reducing inflammation. Ice packs may not be as effective for this type of pain. Limiting fluids can worsen symptoms by drying out the sinuses. Scheduling a CT scan is not necessary at this point as the symptoms described are indicative of sinusitis, which can often be managed with conservative measures like warm compresses.

Correct Answer: C

Rationale: The correct answer is C. The maxillary sinuses are paired cavities located on either side of the nose, beneath the orbits. Ethmoidal sinuses (A) are smaller and located between the eyes. Frontal sinuses (B) are above the eyebrows. Sphenoidal sinuses (D) are deeper within the skull, behind the nasal cavity.