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NEET Questions / Zoology / Chemical Coordination and Integration
Growth hormone is primarily secreted by which gland?
Thyroid gland
Adrenal gland
Pituitary gland
Pancreas
Which hormone is involved in regulating the sleep-wake cycle?
Insulin
Glucagon
Melatonin
Thyroxine
Which hormone is primarily responsible for the regulation of calcium levels in the blood?
Parathyroid hormone (PTH)
Thyroxine (T4)
Growth hormone (GH)
Adrenaline
A patient presents with excessive thirst, frequent urination, and high blood glucose levels. Which hormone deficiency is most likely responsible?
Glucagon
Insulin
Antidiuretic hormone (ADH)
Growth hormone (GH)
Which gland is both an endocrine and exocrine gland?
Pituitary
Thyroid
Pancreas
Adrenal
The hormone melatonin is primarily secreted by which gland?
Pituitary gland
Thyroid gland
Pineal gland
Thymus gland
A researcher discovers a novel hormone that utilizes a tyrosine kinase-linked receptor. Which of the following is LEAST likely to be a downstream effect of this hormone binding to its receptor?
Phosphorylation of intracellular proteins
Activation of a cascade of protein kinases
Changes in gene expression
Direct activation of adenylate cyclase
Certain hormones can exert their effects by altering the permeability of the cell membrane to specific ions. Which of the following scenarios is LEAST likely to be a direct result of such a mechanism?
Changes in membrane potential
Influx of calcium ions leading to muscle contraction
Release of neurotransmitters
Activation of a nuclear receptor
Which of the following is NOT a characteristic of steroid hormone action?
Binding to intracellular receptors
Regulation of gene expression
Long-lasting effects
Rapid onset of action
