12 public questions tagged with this topic.
Cholecystokinin (CCK) stimulates the secretion of pancreatic enzymes, which aid in digestion.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Mechanism of Hormone Action - Second Messengers
The pancreas functions as both an endocrine gland (secreting insulin and glucagon) and an exocrine gland (producing digestive enzymes).
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Pancreas - Insulin Glucagon and Diabetes
GIP inhibits gastric secretion and motility to slow down digestion.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Parathyroid Gland and Thymus
GIP inhibits gastric secretion and motility to slow down the digestive process.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Parathyroid Gland and Thymus
Smooth muscle, which is involuntary, facilitates peristalsis in the digestive tract.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Skeletal System - Axial Skeleton - Ribs Sternum
Smooth muscle, which is involuntary, helps in the peristaltic movement of the alimentary canal.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Skeletal System - Axial Skeleton - Ribs Sternum
The hepatic portal system carries nutrient-rich blood from the intestine to the liver for metabolism before entering systemic circulation.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
The hepatic portal system transports blood rich in nutrients from the intestine to the liver for metabolism.
Ref: NCERT Class 11 Biology Chapter 7: Structural Organisation in Animals Frog - Anatomy - Circulatory and Excretory System
The gall bladder stores bile secreted by the liver and releases it into the duodenum for digestion.
Ref: NCERT Class 11 Biology Chapter 7: Structural Organisation in Animals Animal Tissues - Muscular and Neural Tissue
Flatworm digestive tract remains incomplete, possessing single ventral or anterior mouth opening into blind gastrovascular cavity lacking anus, distinguishing from complete tube. Food enters same orifice, digestion proceeds extracellularly in lumen and intracellularly within gastrodermal cells, undigested residues egested through mouth. Cavity may be sac-like in Acoela, bifurcated in triclad planarians or extensively branched in polyclads increasing absorptive surface area. Parasitic cestodes secondarily lost gut entirely absorbing nutrients across tegument via facilitated transport. Evolution of complete through-gut with separate anal opening in nematodes and higher phyla improves directional processing, regional enzyme specialization and continuous feeding unavailable to Platyhelminthes.
Ref: NCERT Class 11 Biology, Chapter 4: Animal Kingdom, Platyhelminthes incomplete gut
Pogonophorans encompassing small perviate frenulates and large obturate vestimentiferans within Siboglinidae exhibit complete secondary loss of digestive system in adult stage after metamorphosis lacking mouth gut and anus entirely. Evolutionary rationale lies in obligate mutualism with chemosynthetic sulfur-oxidizing bacteria housed in trophosome tissue and capacity of epidermis to absorb dissolved organics directly from seawater. Maintaining energetically expensive gut useless when symbionts supply all requirements. Small frenulates inhabit reducing sediments absorbing sulfide across tube while large vestimentiferans rely exclusively on bacterial chemosynthesis. Therefore gutlessness reflects highly derived adaptation to chemosynthetic habitats not primitive absence of gut structure in ancestral annelids.
Ref: Brusca & Brusca, Chapter 24: Pogonophora gut loss symbionts; Campbell Biology symbiosis
HCl is the correct answer as it accurately identifies the biological location, composition, or distribution described in this question. In Acid, Base, pH, the spatial organization and localization of molecules are critical to their function. HCl is specifically associated with the structure or compartment mentioned because of its unique biochemical properties and physiological role. The other options (H₂SO₄, HNO₃, and CH₃COOH) are primarily associated with different cellular compartments, tissues, or structural contexts.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2
