Concept explainers
To explain: The archenteron.
Introduction: The process of gastrulation leads to the development of a structure called archenteron. Various types of structures and germ layers are formed during the process of gastrulation, which results in important morphogenesis of organism at the embryonic stage of their development.
To determine: Whether archenteron is formed in sea stars.
Introduction: The process of gastrulation leads to the development of a structure called archenteron. Archenteron can be defined as a primary type of gut that is formed during the gastrulation process of development of zygote. It is also known as the digestive tube and develops inside the endoderm and mesoderm layers of an animal.
To determine: Whether archenteron is formed in amphibians.
Introduction: The process of gastrulation leads to the development of a structure called archenteron. Archenteron can be defined as a primary type of gut that is formed during the gastrulation process of development of zygote. It is also known as the digestive tube and develops inside the endoderm and mesoderm layers of an animal.
To determine: Whether archenteron is formed in birds.
Introduction: The process of gastrulation leads to the development of a structure called archenteron. Archenteron can be defined as a primary type of gut that is formed during the gastrulation process of development of zygote. It is also known as the digestive tube and develops inside the endoderm and mesoderm layers of an animal.

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Chapter 51 Solutions
BIOLOGY >PRINT UPGRADE<
- 1. Match each vocabulary term to its best descriptor A. affinity B. efficacy C. inert D. mimic E. how drugs move through body F. how drugs bind Kd Bmax Agonist Antagonist Pharmacokinetics Pharmacodynamicsarrow_forward50 mg dose of a drug is given orally to a patient. The bioavailability of the drug is 0.2. What is the volume of distribution of the drug if the plasma concentration is 1 mg/L? Be sure to provide units.arrow_forwardDetermine Kd and Bmax from the following Scatchard plot. Make sure to include units.arrow_forward
- Choose a catecholamine neurotransmitter and describe/draw the components of the synapse important for its signaling including synthesis, packaging into vesicles, receptors, transporters/degradative enzymes. Describe 2 drugs that can act on this system.arrow_forwardThe following figure is from Caterina et al. The capsaicin receptor: a heat activated ion channel in the pain pathway. Nature, 1997. Black boxes indicate capsaicin, white circles indicate resinferatoxin. a) Which has a higher potency? b) Which is has a higher efficacy? c) What is the approximate Kd of capsaicin in uM? (you can round to the nearest power of 10)arrow_forwardWhat is the rate-limiting-step for serotonin synthesis?arrow_forward
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