The sliding filament model of contraction involves ________.
A) actin and myosin sliding past each other and partially overlapping
B) the shortening of thick filaments so that thin filaments slide past
C) actin and myosin shortening but not sliding past each other
D) the Z discs sliding over the myofilaments
A) actin and myosin sliding past each other and partially overlapping
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Answer the following statements true (T) or false (F)
1. Steroid hormone receptors are in the nucleus of the cell. 2. Steroid hormones do not need a second messenger because they are able to pass through the cell membrane. 3. A cell with an abnormally low number of ribosomes would slow down the effect of a steroid hormone. 4. TSH causes an increase in thyroid hormones when their blood level is too low. This is an example of a positive feedback mechanism. 5. Most hormones use a negative feedback system for regulation.
Match each level of protein structure with its description.
1. applies to proteins containing more than one peptide chain 2. the sequence and number of amino acids in the chain 3. the three-dimensional shape of an amino acid chain; can be fibrous or globular 4. the spatial arrangement of amino acids; can be a helix or a pleated sheet A. primary B. secondary C. tertiary D. quaternary
Muscularis externa typically contains an inner circular layer and an outer longitudinal layer
Indicate whether the statement is true or false
Which of the following routes of blood flow is correct?
A) Heart ? distributing artery ? conducting artery ? arteriole ? capillary ? venule ? large vein ? medium vein ? heart B) Heart ? conducting artery ? distributing artery ? arteriole ? capillary ? venule ? medium vein ? large vein ? heart C) Heart ? large vein ? medium vein ? venule? capillary ? arteriole ? distributing artery ? conducting artery ? heart D) Heart ? venule ? medium vein ? large vein ? capillary ? conducting artery ? distributing artery ? arteriole ? heart