27. Mechanism by which gases move across plasma membranes a. diffusion b. carrie

Question

27. Mechanism by which gases move across plasma membranes a. diffusion b. carrier mediated transport c. facilitated diffusion d. osmosis e. primary active transport 28. Trigger for glut4 insertion into plasma membranes rion a. change in RMP b. exercise c. insulin d. a and b e. b and c outside of the cell and (K+] ?s__ outside outside 29. The Nat/K+ ATPase ensures that [Nat] is [Na+] is __ a.g higher, higher b. higher, lower c. lower, higher, d. lower, lower the cel 30. Glycine in the central nervous system can open Cl- channels in the plasma membrane. Cmoving into the cell and would represent a(n) event. would a. depolarize, inhibitory b. depolarize, stimulatory c. hyperpolarize, inhibitory d. hyperpolarize, stimulatory uto a ba 31. RMP is established by: orode ods to IIA a. b. c. d. e. Concentrations of ions inside and outside of the cell Membrane permeability to solutes Nat/K+ ATPase All of the above A and B 0 d 32. Most likely basis for same ligand, same receptor, different effects in different tissues (think acetylcholine receptors) a. Activation of identical signal transduction pathways b. Binding of plasma membrane versus intracellular receptors c. Receptor subtypes d. Same effector can have different effects in different tissues e. Signal transduction pathways are identical for all cells 33. Generally true for signal transduction when considering agonists binding to intracellular receptors a. All lipophilic agonists bind intracellular receptors b. Involves activation of effectors and second messengers c. Short duration of effects d. Often involves binding of receptorfagonist complex to DNA e. Rapid action

Explanation / Answer

27. Diffusion [ diffusion is a process in which gas move across their concentration gradient, all other option either need ATP or a carrier protein. Osmosis is processed by which liquid moves not gas].

28. Insulin [ GLUT4 is an insulin-dependent glucose transporter present in the adipose tissue and muscle tissue]

29. b) Higher, lower [ Na K ATPase moves 3 molecule Na out of the cell and brings 2 molecules of K inside the cell, the main function is to maintain the normal resting membrane potential ]

30. c. Hyperpolarize, inhibitory [ Cl- entry into the cell will make the inner side of the cell wall more negative than resting membrane potential, thereby will hyperpolarize the cell as it will need more powerful stimulus to depolarize the cell, hyperpolarization will make the nerve cell refractory to a normal stimulus which is inhibitory effect]

31. d. all of above [ to establish resting membrane potential, cell need Na K ATPase which maintains the Na and K concentration inside and outside the cell. The concentration of ios is the basis of the main electrochemical gradient to maintain RMP. The permeability of membrane ensures Na and K concentration kept at an equilibrium ]

32. Receptor subtypes [ skeletal muscle have the nicotinic receptor, acetylcholine has an excitatory effect on nicotinic receptor--> contraction of skeletal muscle. But heart muscle has muscarinic receptors, acetylcholine has an inhibitory effect on muscarinic receptors--> so inhibit contraction of heart muscle.]

33. d. Often involves binding of receptor/agonist complex to DNA [ option a: to bind intracellular receptors must be a lipophilic ligand, but all lipophilic ligand does not bind to intracellular receptors, a lipophilic ligand can bind to extracellular receptors also. The second messenger is mainly involved in extracellular receptors. extracellular receptors are short-acting due to hydrolysis by enzymes. Intracellular receptors are not always rapid in action. Intracellular receptors mostly bind with a lipophilic receptor and then that complex bind to the nuclear DNA----> transcription of desired protein and --> effect. So it takes time]

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.