BIOS255 Comprehensive Exam Review Questions
With Correct Answers 100% Verified
Homeostasis -CORRECT ANSWERS-
* Presence of stable internal environment
* Failure to maintain homeostasis leads to illness or death
Homeostatic Regulation-CORRECT ANSWERS-
Physiological adjustment to preserve homeostasis in variable environments
Feedback-CORRECT ANSWERS-Stimulation of a receptor triggers response that changes
environment at that receptor
Negative Feedback -CORRECT ANSWERS-
* Effector opposes or negates the original stimulus
* Minimizes change
* Primary mechanism of homeostatic regulation in the body
* Dynamic process: Set point varies with varying environments & activity levels
Negative Feedback Receptors-CORRECT ANSWERS-Temperature receptors in skin & brain are
stimulated & send signals to the control center
,Negative Feedback Control Center-CORRECT ANSWERS-The temperature control center
received information from the two sets of temperature receptors & sends commands to the
effectors
Negative Feedback Effectors-CORRECT ANSWERS-
Sweat glands & smooth muscle in the walls of blood vessels supplying the skin respond
Positive Feedback-CORRECT ANSWERS-* Stimulus produces a response that exaggerates or
enhances the original change (rather than opposing it)
* Tends to produce extreme responses
* Does not restore homeostasis
Positive Feedback Loop-CORRECT ANSWERS-* Escalating cycle
* Typically occurs when a potentially dangerous or stressful process must be completed quickly
before the body can restore homeostasis
Steps of Positive Feedback in Blood Clotting-CORRECT ANSWERS-
1. Damage to cells in the blood vessel wall releases chemicals that begin the process of blood
clotting
2. The chemicals start chain reactions in which cells, cell fragments, & soluble proteins in the
blood begin to form a clot
3. As clotting continues, each step releases chemicals that further accelerate the process
4. This escalating process is a positive feedback loop that ends with the formation of a blood clot,
which patches the vessel wall & stops the bleeding
, Epithelial Tissue-CORRECT ANSWERS-
* Epithelia
* Glands (Exocrine & Endocrine)
Functions of Epithelial Tissue-CORRECT ANSWERS-
* Provide physical protection
* Control permeability
* Provide sensation
* Produce specialized secretions
Characteristic of Epithelial Tissue-CORRECT ANSWERS-
* Specialized contacts with other cells
* Polarity (different ends of cell do different things)
* Avascularity (NO blood supply)
* Regeneration (can divide to make new cells)
* Cellularity (lots of cells in close contact)
Characteristics of Epithelial Tissue: -CORRECT ANSWERS- Specialized Contacts
Epithelial cells are held close together by cell junctions
Features of Epithelial Tissue-CORRECT ANSWERS-
With Correct Answers 100% Verified
Homeostasis -CORRECT ANSWERS-
* Presence of stable internal environment
* Failure to maintain homeostasis leads to illness or death
Homeostatic Regulation-CORRECT ANSWERS-
Physiological adjustment to preserve homeostasis in variable environments
Feedback-CORRECT ANSWERS-Stimulation of a receptor triggers response that changes
environment at that receptor
Negative Feedback -CORRECT ANSWERS-
* Effector opposes or negates the original stimulus
* Minimizes change
* Primary mechanism of homeostatic regulation in the body
* Dynamic process: Set point varies with varying environments & activity levels
Negative Feedback Receptors-CORRECT ANSWERS-Temperature receptors in skin & brain are
stimulated & send signals to the control center
,Negative Feedback Control Center-CORRECT ANSWERS-The temperature control center
received information from the two sets of temperature receptors & sends commands to the
effectors
Negative Feedback Effectors-CORRECT ANSWERS-
Sweat glands & smooth muscle in the walls of blood vessels supplying the skin respond
Positive Feedback-CORRECT ANSWERS-* Stimulus produces a response that exaggerates or
enhances the original change (rather than opposing it)
* Tends to produce extreme responses
* Does not restore homeostasis
Positive Feedback Loop-CORRECT ANSWERS-* Escalating cycle
* Typically occurs when a potentially dangerous or stressful process must be completed quickly
before the body can restore homeostasis
Steps of Positive Feedback in Blood Clotting-CORRECT ANSWERS-
1. Damage to cells in the blood vessel wall releases chemicals that begin the process of blood
clotting
2. The chemicals start chain reactions in which cells, cell fragments, & soluble proteins in the
blood begin to form a clot
3. As clotting continues, each step releases chemicals that further accelerate the process
4. This escalating process is a positive feedback loop that ends with the formation of a blood clot,
which patches the vessel wall & stops the bleeding
, Epithelial Tissue-CORRECT ANSWERS-
* Epithelia
* Glands (Exocrine & Endocrine)
Functions of Epithelial Tissue-CORRECT ANSWERS-
* Provide physical protection
* Control permeability
* Provide sensation
* Produce specialized secretions
Characteristic of Epithelial Tissue-CORRECT ANSWERS-
* Specialized contacts with other cells
* Polarity (different ends of cell do different things)
* Avascularity (NO blood supply)
* Regeneration (can divide to make new cells)
* Cellularity (lots of cells in close contact)
Characteristics of Epithelial Tissue: -CORRECT ANSWERS- Specialized Contacts
Epithelial cells are held close together by cell junctions
Features of Epithelial Tissue-CORRECT ANSWERS-
