Tag: science & technology

The scalene muscles in the neck assist in coughing by helping to elevate the first and second ribs during forceful expiration. While the diaphragm and abdominal muscles are the primary cough muscles, the scalenes contribute to the forceful exhalation needed for an effective cough. The other options are incorrect: sternohyoids are neck muscles for hyoid bone depression, trapezius is for shoulder movement.

The human salivary glands produce approximately 1-1.5 liters of saliva per day, with 1 liter being the accepted average for normal physiological function. Saliva is essential for digestion, oral hygiene, and lubrication. The other options are too high for normal production. Saliva production varies with meals, time of day, and individual factors.

The orbicularis oculi muscle is responsible for closing the eyelid during blinking. This circular muscle surrounds the eye and contracts to close the eye. The other options are incorrect: depressor labii inferioris is for lower lip depression, orbicularis oris is for lip movement, thyroid cartilage forms the Adam's apple structure (not a muscle for blinking).

The Adam's apple is formed by the thyroid cartilage, the largest cartilage of the larynx (voice box). This cartilage is more prominent in males due to the influence of testosterone during puberty, causing it to grow larger and tilt forward, creating the visible neck protrusion. The other options are incorrect: windpipe is the trachea, bronchus carries air to lungs, orbicularis oculi is an eyelid muscle.

The deltoid muscle, specifically the middle fibers, is primarily responsible for abducting the arm sideways (raising it away from the body in the coronal plane). This large, triangular muscle covers the shoulder joint and is the main abductor of the arm beyond 15 degrees. The other options are incorrect: bronchus is an airway tube, flexor pollicis moves the thumb, biceps flexes the elbow.

Lightyear measures distance, not time. Second, minute, day, and year are all time units, making lightyear the odd one out.

Venus is an inner planet (orbiting closer to the Sun than Earth), while Mars, Jupiter, and Saturn are all outer planets. This makes Venus the odd one out based on planetary classification.