According to the starling law, parasympathetic effects on cardiac rate and contractility include decreasing the rate of contraction and increasing the filling time resulting in a stronger contraction.
The Frank-starling law of the heart states that the stroke volume of the heart increases in response to an increase in the volume of blood filling the heart when all other factors remain constant.
        
                    
             
        
        
        
Answer:
Warm air rises, creating a low pressure zone; cool air sinks, creating a high pressure zone.
 
        
                    
             
        
        
        
Answer:
50%
Explanation:
This question involves a single gene with two alleles W and w in puppies. According to the question, the genotype of the parent organisms are Ww. In a cross between the two parents i.e. Ww × Ww, the following gametes will be produced by each parent: W and w. 
Using these gametes in a punnet square (see attached image), the following genotype of offsprings will be produced: WW, Ww, Ww, ww. Hence, based on this question, the percentage of puppies that would have the same genotype as the parents, Ww are 1/2 × 100% = 50%. 
 
        
             
        
        
        
Answer:
when an organism is homozygous at the locus
Explanation:
 
        
             
        
        
        
Answer:
the external oblique.
Explanation:
<u>the external oblique</u> covers the ventral, abdominal region in rats.