BIO 141 Midterm 4
Not directly involved in the clotting process
hemoglobin
When the effect of the stimulus is counteracted, is called______ feedback?
negative
How can red blood cells bind to oxygen in the lungs but then offload it near body cells that need it?
oxygen diffuses into or out of the blood following its concentration gradient
Which organ secretes neutralize stomach acid before it reaches the intestines?
pancreas
Maintaining a steady state internal environment, despite a changing external environment, is called ________.
Homeostasis
Function of the sinatrial node?
Initiates the contraction of the heart
Blood cells that fight infections
Lymphocytes
True or false?
Mechanical and chemical digestion both occur in the mouth and int he stomach
What moves your food in your trachea?
Peristaltic muscle contractions
Role of epiglottis
Prevents food from entering the windpipe
The intensity of competition between 2 species increase as
The similarity of their lifestyle and requirements and lifestyles increases when resources are limited
Choose the defining characteristic of all arteries.
They carry blood away from the heart.
What does the villi do?
To absorb small nutrient molecules from the digestive tract
not a function of the circulatory system?
To produce and store all of the immune system cells
"lub," "dub" physical action of the heart
"lub" signifies the closing of the AV valves; "dub" signifies the closing of the semilunar valves
The term interface can be used to describe the surface across which molecules and ions are exchanged, often diffusing between external and internal environments or between organ systems. What part of the respiratory system forms the interface between the respiratory system and the circulatory system?
Alveoli
Which of the following statements about the bones is false?
Bones are dry and dead, made up of calcium and connective fibers with a few blood vessels running through them
function of the circulatory system
To transport nutrients to the cells and to remove wastes from the cells To carry chemical signals, such as hormones through the body To distribute heat throughout the body
Which medication prevents viral infections by priming the immune system against a specific virus?
Vaccine
Where are red and white blood cells produced?
bone marrow
What kind of effect has an increasing impact as population size increases?
density-dependant
Organs are made up of a collection of
different types of tissues
Most accurate about systolic pressure
it is the pressure when the heart contracts
Where in the human digestive system are the substances that help digest fat produced?
liver
When talking about the pulmonary circuit, this specifically circulates blood to the
lungs
What carries a signal from one neuron to the next?
neurotransmitter
Most of the absorption of nutrients (besides water) takes place in the
small intestine
Blood vessel that drain blood from the head and shoulders
superior vena cava
Not a major component of the digestive system
thyroid
Which type of white blood cells produce defensive proteins called antibodies?
B cells
Pathway of blood through the heart
body ->RA -> RV -> lungs -> LA -> LV -> body
Essential nutrient is specifically a nutrient that your body _____________
cannot make itself
Thinnest blood vessels
capillaries
