What substance move freely in and out of a cell by diffusion?

Proteins

Enzymes

Hormones

Electrolytes

Answer and Explanation

The Correct Answer is C

A) Proteins:
Proteins are generally too large to diffuse freely across the cell membrane. They require specific transport mechanisms, such as endocytosis or transport proteins, to move in and out of cells. The hydrophilic nature of most proteins further complicates their passage across the lipid bilayer.

B) Enzymes:
Like proteins, enzymes are large molecules that do not freely diffuse across cell membranes. Enzymes, being proteins, also need specialized transport mechanisms or need to be secreted or endocytosed to enter or exit cells.

C) Hormones:
Many hormones, particularly lipid-soluble ones like steroid hormones, can diffuse freely across the cell membrane. These hormones pass through the lipid bilayer due to their hydrophobic nature and bind to intracellular receptors, initiating cellular responses. However, water-soluble hormones (e.g., insulin) typically do not diffuse freely but interact with receptors on the cell surface.

D) Electrolytes:
Electrolytes (such as sodium, potassium, calcium, and chloride ions) are charged particles that cannot pass freely through the lipid bilayer due to the hydrophobic interior of the cell membrane. They require specific ion channels or transporters to move in and out of the cell. Diffusion of electrolytes is facilitated through these channels, but it is not a simple diffusion process as seen with small, uncharged molecules.

Nursing Test Bank

Quiz #1: RN Exams Pharmacology Exams Quiz #2: RN Exams Medical-Surgical Exams Quiz #3: RN Exams Fundamentals Exams Quiz #4: RN Exams Maternal-Newborn Exams Quiz #5: RN Exams Anatomy and Physiology Exams Quiz #6: RN Exams Obstetrics and Pediatrics Exams Quiz #7: RN Exams Fluid and Electrolytes Exams Quiz #8: RN Exams Community Health Exams Quiz #9: RN Exams Promoting Health across the lifespan Exams Quiz #10: RN Exams Multidimensional care Exams

Get 100+ Naxlex Exit Exams for $79 Try Naxlex NCLEX-RN (14 Day Free-Trial)

Naxlex Comprehensive Predictor Exams

Quiz #1: Naxlex RN Comprehensive online practice 2019 B with NGN Quiz #2: Naxlex RN Comprehensive Predictor 2023 Quiz #3: Naxlex RN Comprehensive Predictor 2023 Exit Exam A Quiz #4: Naxlex HESI Exit LPN Exam Quiz #5: Naxlex PN Comprehensive Predictor PN 2020 Quiz #6: Naxlex VATI PN Comprehensive Predictor 2020 Quiz #8: Naxlex PN Comprehensive Predictor 2023 - Exam 1 Quiz #10: Naxlex HESI PN Exit exam Quiz #11: Naxlex HESI PN EXIT Exam 2

Free Nursing Study Resources

Correct Answer is A

Explanation

A) Increased intraocular pressure: Sympathomimetic drugs stimulate the sympathetic nervous system and promote "fight or flight" responses, often resulting in vasoconstriction and other effects. Some sympathomimetics, especially those that affect alpha-adrenergic receptors, can lead to increased intraocular pressure, which is a concern in conditions like glaucoma.

B) Decreased blood pressure: Sympathomimetic drugs generally increase blood pressure by stimulating alpha and beta receptors that cause vasoconstriction and increased heart rate. In contrast, drugs that would decrease blood pressure are usually parasympathomimetics or other agents designed to block sympathetic responses.

C) Decreased heart rate: Sympathomimetic drugs typically increase heart rate by stimulating beta-1 adrenergic receptors in the heart. These drugs are used in situations requiring increased cardiac output or to counteract bradycardia. Decreased heart rate would typically occur with parasympathomimetic drugs or medications that block sympathetic activity (e.g., beta blockers).

D) Increased respiration: Sympathomimetic drugs can increase respiratory rate by promoting bronchodilation through beta-2 adrenergic receptor activation in the lungs. However, "increased respiration" as a general effect is not as specific or consistent as the other cardiovascular and ocular effects of these drugs. The primary and most prominent physiological change would be related to the cardiovascular effects.

A. Bradycardia B. Rash C. Vomiting D. Fever E. Weakness F. Drooling

Correct Answer is ["A","C","E","F"]

Explanation

A) Bradycardia: Bradycardia is a common symptom of a cholinergic crisis. It results from excessive acetylcholine at the neuromuscular junction, which can overstimulate the parasympathetic nervous system, leading to a decrease in heart rate.

B) Rash: A rash is not a typical symptom of a cholinergic crisis. Rash might occur as a side effect of medications or other conditions, but it is not a hallmark feature of a cholinergic crisis in myasthenia gravis.

C) Vomiting: Vomiting is a potential symptom of a cholinergic crisis. It occurs due to the excessive stimulation of the parasympathetic nervous system, which can cause gastrointestinal distress and nausea.

D) Fever: Fever is not typically associated with a cholinergic crisis, but it can occur if there is an underlying infection or other condition. A cholinergic crisis itself usually leads to symptoms like weakness and excessive salivation, not fever.

E) Weakness: Weakness is a hallmark symptom of a cholinergic crisis, as it results from overstimulation at the neuromuscular junction, leading to muscle fatigue and paralysis. This is similar to the symptoms of myasthenia gravis, but in a cholinergic crisis, the weakness is more profound.

F) Drooling: Drooling is another common symptom of a cholinergic crisis. Excessive acetylcholine can lead to excessive salivation due to overstimulation of the parasympathetic nervous system.

View Question and Answer

Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.

Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today

What substance move freely in and out of a cell by diffusion?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

What action do sympathomimetic drugs have in the body?

Correct Answer is A

Explanation

A client with myasthenia gravis is experiencing a cholinergic crisis. Which symptoms are associated with this condition? (Select all that apply.)

Correct Answer is ["A","C","E","F"]

Explanation

The nurse assess that the patient is having a sympathetic response when noting what manifestation?

Neuron that use Acetylcholine (ACh) as its neurotransmitter are what type of neuron?

A 10 year old child is brought to a respiratory clinic and is prescribed Atrovent (Ipratropium Bromide). Prior to administering the medication, what would the nurse assess for?

When hormones, formed within a cell, move across the cell membrane, the process is call what?

A patient has symptoms that are characteristic of multiple sclerosis (MS). Which diagnostic tests are likely to be ordered to aid in the diagnosis of this patient?

An older patient exhibits a shuffling gait, lack of facial expression, and tremors at rest. The nurse will expect the provider to order which medication for this patient?

A patient who has Parkinson disease is being treated with the anticholinergic medication benztropine (Cogentin). The nurse will tell the patient that this drug will have which effect?

Which of the following physiologic principles would be considered a function of the somatic nervous system?