What defines a passive bloodstain?
Passive stains include drops, flows and pools, and typically result from gravity acting on an injured body. Transfer stains result from objects coming into contact with existing bloodstains and leaving wipes, swipes or pattern transfers behind such as a bloody shoe print or a smear from a body being dragged.
What are the 4 types of passive bloodstains?
Passive. a. formed from the force of gravity acting alone. b. subdivided (drops, drip patterns, pools, clots) c. oozing or gushes from the body, dripping finger or arm, drops from a knife.
What shape do blood droplets form when dropped vertically what factors lead to this formation?
The spherical shape is caused by the surface tension of the blood. Surface Tension causes the blood drop to pull itself in; both horizontally and vertically. The blood drop will settle into a spherical shape, as a result of the surface tension.
What is a skeletonized bloodstain?
A bloodstain pattern that can arise if a blood drop is allowed to partially dry and is then wiped. Since the blood tends to be thinner at the edge of the drops, this portion dries first, leaving liquid in the middle.
What is a projectile bloodstain?
A bloodstain pattern resulting from blood drops which can be produced when a projectile creates an entrance wound. Blood clot. A gelatinous mass formed by a complex mechanism involving red blood cells, fibrinogen, platelets, and other clotting factors. DRAFT.
What is a drip stain?
A bloodstain pattern resulting from a liquid that dripped into another liquid, at least one of which was blood. Drip Stain. A bloodstain resulting from a falling drop that formed due to gravity. Drip Trail. A bloodstain pattern resulting from the movement of a source of drip stains between two points.
What is drip stain?
Drip Stain A bloodstain resulting from a falling drop that formed due to gravity. Drip Trail A bloodstain pattern resulting from the movement of a source of drip stains between two points.
What shape are passive blood drops?
spherically shaped
Passive Bloodstain Patterns. The fluid dynamics of dropping blood are responsible for the stains or patterns produced. The surface tension of the liquid blood causes the blood drops produced from a blood source to be spherically shaped.
What is the shape of a drop produced from a passive drop?
Passive drops will vary in shape and size depending on the volume of blood and the surface texture, but will generally be circular.
What are secondary blood droplets called?
If any blood does overcome cohesion and separate from the main droplet of blood, it will form a small secondary droplets called satellites.
What is a secondary splatter?
Secondary spatter is a result of an event other than the blood loss event and refers to satellite spatter. When the blood contacts another surface or additional blood on the surface.
What is stippling and internal muzzle staining?
Stippling. Burns or gunpowder on a victims skin from a gunshot at close range. Internal muzzle staining. When explosive gases from a gunshot cause blood to be pulled into the muzzle of a gun.
What is it called when blood dries?
During the coagulation (clotting) process, fibrin strands are formed creating a solid structure of the blood, the clot. During drying water evaporates from the blood pool until only the solid matter, mainly red blood cells (RBC’s), remains.
What shape does blood have in flight?
Experiments with blood have shown that a drop of blood tends to form into a sphere in flight rather than the artistic teardrop shape. The formation of the sphere is a result of surface tension and cohesion that binds the molecules together.
What term is given to the angle at which a blood drop strikes a surface a area of convergence b angle of impact c impact pattern D drop angle?
Angle of Impact
Angle of Impact – The angle at which a blood drop strikes a surface. Area of Convergence – The area containing the intersections generated by lines drawn through the long axes of individual stains that indicates in two dimensions the location of the blood source.
What is back spatter?
Back Spatter — Blood directed back towards the source of energy or force that caused the spatter. Bloodstain — Evidence that liquid blood has come into contact with a surface.
Does blood dry pink?
Finding and documenting blood residue Freshly dried bloodstains are a glossy reddish-brown in color. Under the influence of sunlight, the weather or removal attempts, the color eventually disappears and the stain turns grey.
What is the liquid component of blood?
The liquid component of the blood in which the following blood cells are suspended: Red blood cells (erythrocytes). These carry oxygen from the lungs to the rest of the body. White blood cells (leukocytes).
What are blood cells?
The liquid component of the blood in which the following blood cells are suspended: Red blood cells (erythrocytes). These carry oxygen from the lungs to the rest of the body. White blood cells (leukocytes). These help fight infections and aid in the immune process. Types of white blood cells include:
What are the components of human blood Quizlet?
The components of human blood are: Plasma. The liquid component of the blood in which the following blood cells are suspended: Red blood cells (erythrocytes). These carry oxygen from the lungs to the rest of the body. White blood cells (leukocytes).
What does blood carry away from the body tissues?
Blood carries the following away from the body tissues: What are the components of blood? The components of human blood are: Plasma. The liquid component of the blood in which the following blood cells are suspended: