What mineral is responsible for muscle contractoins?
A. Chlorde
B. Sodium
C. Calcium
D. Magnesium - D. Calcium
The answer is calcium because in order
... [Show More] for muscle contractions to occur, calcium ions are released from
the sarcoplasmic reticulum which binds to the inhibitory protein, troponin, causing it to move away
from the myosin binding spots on actin. Once the binding spots are open, the myosin head can attach to
the ATP binding site and cause the muscle contraction cycle.
In which of the following locations would the urinary bladder and internal reproductive organs be
found?
A. Thoracic Cavity
B. Mediastinum
C. Abdominal Cavity
D. Pelvic Cavity - D. Pelvic Cavity
The answer is pelvic cavity because this part of the body contains primarily reproductive organs: urinary
bladder, pelvic colon, and rectum.
Thoracic cavity contains the cardiovascular system, respiratory system, and digestive system.
The mediastinum contains all the chest organs except the lungs.
What separates the thoracic cavity from the abdominal cavity?
A. DiaphragmB. Mediastinum
C. Liver
D. Lungs - A. Diaphragm
The diaphgram is the muscle that separates the thoracic cavity and the abdominal cavity. This also
assists in respiration.
Which of the following epithelial types is correctly matched with its major function?
A. Simple squamous epithelium - secretion or absorption
B. Stratified squamous epithelium - changes shape when stretched
C. Stratified squamous epithelium - diffusion
D. Simple columnar epithelium - secretion or absorption - D. Simple columnar epithelium - secretion or
absorption
The answer is simple columnar epithelium. Simple columnar epithelium specializes in secretion and
absorption. It secretes mucus from it's goblet cells and absorbs with it's microvilli on the apical surface.
Simple squamous epithelium is a cell that has a thin and flat surface. Simple squamous epithelium
specializes in filtration or diffusion due to it's thin surface.
Stratified squamous epithelium is squamous epithelium that are stacked upon each other many times.
The function of this type of cell is to withstand abrasion with it's many layers and is the first line of
defense against microbes.
Transitional epithelium is a type of tissue that can stretch and maintain protective lining while capable
of holding fluid without rupturing. You can mostly find these in urinary organs like the urinary bladder.
A tissue examined under the microscope exhibits the following characteristics: cells found on internal
surface of stomach, no extracellular matrix, cells tall and thin, no blood vessels in the tissue. What type
of tissue is this?
A. Epithelial [Show Less]