Glands, Such as the Thyroid, That Secrete Their Products Directly

question 32

Multiple Choice

Glands, such as the thyroid, that secrete their products directly into the blood rather than through ducts are classified as:

• A) exocrine.
• B) ceruminous.
• C) endocrine.
• D) sebaceous.

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Definitions:

Tropomyosin

A protein that runs along the length of the actin filament in muscle fibers and, along with troponin, regulates muscle contraction.

Sarcoplasmic Reticulum

A network of membranes found within muscle cells that stores and releases calcium ions, aiding in muscle contraction.

Sarcolemma

The cell membrane surrounding a muscle fiber, playing a crucial role in muscle contraction.

Acetylcholine Receptors

Protein receptors located in the neuro-muscular junction and various parts of the nervous system that bind acetylcholine, facilitating neurotransmission.