Save
Upgrade to remove ads
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

body fluids chap 6

QuestionAnswer
What is the difference between secretion and excretion? Secretion is the production of useful substances (e.g., saliva, mucus, hormones), while excretion is the elimination of waste (e.g., sweat, urine, feces)
What is the role of blood in forensic science? Blood is studied through hematology and serology to understand toxicology, cause of death, and body fluid analysis at crime scenes. Plasma makes up 55% of blood and contains water, proteins, and lipids. B-cells in blood help identify blood types and trigg
How does the ABO blood system work? Blood types are determined by A and B antigens on red blood cells. For example: Type A has A antigens Type B has B antigens Type AB has both Type O has neither Antibodies in plasma cause agglutination (clumping) when incompatible blood types mix.
What is the Rh factor and how does it affect blood typing? The Rh factor is a D-antigen; if present, blood is Rh+. If absent, it's Rh-. Blood types include A+, A-, B+, etc. Matching both ABO and Rh is important during transfusions to prevent immune reactions.
What are the limitations of using blood typing in forensics? Cannot establish identity—only narrows suspects Environmental degradation affects results Mixed blood samples complicate analysis Recent blood transfusions may alter blood typing Blood type doesn’t indicate ancestry or origin
How is blood typing used in paternity testing? It’s used to include or exclude potential fathers based on the blood types of the child, mother, and presumed father.
What questions do forensic investigators ask about blood at a crime scene? Where is the blood? Is this actually blood? Is it human blood? How is the blood distributed?
What methods are used to detect blood at a crime scene? Presumptive Tests Fluorescein Luminol ALS (Alternative Light Sources) Kastle-Meyer Test Radial Diffusion Method RSID (Rapid Stain Identification)
How does DNA analysis help with blood evidence? PCR: Amplifies DNA from small samples (even mitochondrial DNA) DNA Barcoding: Differentiates between species in mixed blood samples
What types of bloodstains are found at crime scenes? Passive: Gravity-driven (drops, pools, flows) Transfer: From contact with bloody surfaces (handprints) Impact: From forceful actions like beatings Projection: From pressure (e.g., arterial spurts, sneezing)
What factors affect bloodstain shape and size? Drop Height Impact Angle Surface Texture
What can bloodstain pattern analysis reveal? Type of weapon Number of blows Position and movement of individuals Time since death Presence of cleaning attempts or interference
What are the differences in velocity when it comes to impact stains? Low Velocity: Dripping (large drops) Medium Velocity: Blunt force trauma (1–4 mm drops) High Velocity: Gunshot wounds (fine mist, <1 mm)
What are common projection blood patterns? Arterial Spurts: Pulsating pattern from heart pressure Expiration Spatter: From coughing/sneezing, fine mist droplets
What are altered bloodstains and what do they indicate? Clotted: Suggests time since bleeding Diluted: Cleaning attempts Diffused: Interaction or movement Dried: Indicates elapsed time Voids: Something blocked the spatter Insect-Altered: Shows presence/activity of insects
How is bloodstain angle of impact analyzed? Using trigonometry to calculate the angle of impact and determine the point of convergence (origin of blood)
What is the stringing method in bloodstain analysis? A physical method where strings are used to visualize blood droplet angles and direction, helping estimate the 3D origin of the blood.
What are challenges in bloodstain pattern estimation? Victim movement Multiple injuries or weapons Complex or overlapping spatter patterns
Created by: Forensics2025
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards