FREE AND STUDY GAMES ABOUT PHYSIO HOMEOSTASIS

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FREE AND STUDY GAMES ABOUT PHYSIO HOMEOSTASIS

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -29 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: What is an example of a neurohormone reflex?

Answer:

Secretion of oxytocin in response to suckling

Question 2: What is acclimatization?

Answer:

The adaptation of physiological processes to a given set of environmental conditions (natural approach)

Question 3: What is Cannon's fourth postulate?

Answer:

One chemical signal can have different effects in different tissues

Question 4: What is the pathway of a neurohormone reflex?

Answer:

Stimulus activates receptor&binds to sensory neuron(afferent pathway) which goes to CNS integrating center &releases NT. The NT is picked up by efferent neuron &releases neurohormone to bloodstream,exits,binds to target cell (effector), causes a response

Question 5: What is Cannon's first postulate?

Answer:

The nervous system has a role in preserving the "fitness" of the internal environment.Question 6: What is the difference between tonic control and antagonistic control?

Answer:

Tonic control usually involves one control system, but antagonistic control uses two

Question 7: Local control occurs when

Answer:

a cell or tissue senses a change in its immediate vicinity and responds within the region where the change took place Question 8: Does the aquarium heating system function using positive feedback or negative feedback?

Answer:

Negative feedback shuts off the heater.

Question 9: What is feedforward control?

Answer:

A reflex that evolved for the body to predict or anticipate that a change is about to occur. It starts the response loop. ex. salivation reflex

Question 10: Reflex Pathway

Answer:

An integrating center located away from the affected cell or tissue receives information, evaluates it, and decides whether to send a chemical or electrical signal to initiate a response

Question 11: What is a positive feedback loop?

Answer:

It occurs when the response reinforces the stimulus rather than decreasing or removing it. Its response sends the regulated variable further from its normal value and needs some intervention or event outside the loop to stop the response.

Question 12: How can one chemical signal have opposite effects in two different tissues?

Answer:

A signal can have opposite effects by using different receptors or different signal pathways

Question 13: What is an example of a simple neural reflex?

Answer:

A knee jerk Question 14: Long distance reflex pathways involve two control systems:

Answer:

the nervous system and the endocrine system

Question 15: What is the difference between local control and reflex control?

Answer:

Local control takes place in or very close to the target cell. Reflex control is mediated by a distant integrating center

Question 16: What is the pathway of a simple endocrine reflex?

Answer:

Stimulus, receptor on an endocrine integrating center, releases classic hormone, which goes into the bloodstream, binds to target cell (effector) which causes a response

Question 17: What is the pathway of a simple neural reflex?

Answer:

Stimulus, receptor, sensory neuron (afferent pathway) CNS integrating center, efferent neuron, release of neurotransmitter onto target cell (effector) causes a respons

Question 18: What is tonic control?

Answer:

Has a basal level of activity (not zero or max) that can increase or decrease that response. Like the volume knob on the radio

Question 19: What is antagonistic control?

Answer:

Systems that work in opposition to each other which contain set points and normal ranges of regulated variables. Has a sinusoidal curve. Ex. body temp

Question 20: Three primary components of a response loop

Answer:

an input signal, the integration of the signal, and an output signal

Question 21: What is Cannon's second postulate?

Answer:

Some systems of the body are under tonic control

Question 22: What is Cannon's third postulate?

Answer:

Some systems of the body are under antagonistic control

Question 23: What is an example of a simple endocrine reflex?

Answer:

Insulin release in response to an increase in blood glucose

Question 24: What is oxytocin?

Answer:

It is a hormone which causes the uterus to contract and push the baby's head harder against the cervix, further stretching it.

Question 25: What is a feedback loop?

Answer:

Feedbackloops are homeostatic which means that they are designed to keep the system at or near a set point so that the variable being regulated is relatively stable.

Question 26: What is acclimation?

Answer:

The process is induced artificially in a lab setting Question 27: Name the seven steps in a reflex control pathway in their correct order

Answer:

Stimulus, sensor or sensory receptor, afferent pathway, integrating center, efferent pathway, target or effector, response (tissue and systemic)