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Does sympathetic stimulation of the heart increases heart rate and force contractions?
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What does epinephrine do to the blood vessels?
Sympathetic stimulation (I'm guessing you mean your bodie's reaction in fight or flight) makes the blood vessles tighten, or constrict, hightening blood pressure. This is bad for you over long periods of time.
What happens if the heart receives more sympathetic stimulation than parasympathetic stimulation?
increase its rate and force of contraction
What are two experimental ways that the mode of stimulation can affect the muscle force?
Isotonic and Isometric Contractions
What two mechanisms influence the force of cardiac contraction?
End diastolic volume and sympathetic nervous system stimulation
Why are isotonic and isometric contractions two experimental ways that the mode of stimulation can affect the muscle force?
ask you doctor
What is the sympathetic effect on the heart?
Heart rate increases with sympathetic nervous system. There is increase in stroke volume and cardiac output. With stimulation of vagus nerve or parasympathetic nervous system, You have decrease in heart rate. There is decrease the stroke volume and cardiac output.
What happens to the amount of total force the muscle generates during the stimulated twitch?
The total force that a muscle generates during a stimulated twitch depends on the frequency and intensity of the stimulation. In general, as the stimulation frequency increases, the force generated by the muscle also increases up to a point, where it reaches a plateau known as tetanus. After this point, increasing the stimulation frequency further does not significantly increase the force output.
Which nervous system division controls smooth muscle contraction and secretion in the digestive system?
The parasympathetic division of the autonomic nervous system controls smooth muscle contraction and secretion in the digestive system. It is responsible for enhancing digestion and absorption of nutrients by increasing gastrointestinal motility and stimulating glandular secretions.
How does the frequency of stimulation affect the amount of force generated by the muscle?
Increasing the stimulus to an isolated muscle increases the strength of a contraction. A muscle begins to contract when the stimulus is given; however, if the muscle does not finish contracting before the next stimulus hits, then the force of the contraction will increase to finish the contraction. This is known as wave summation.
What do you call the increase in the number of motor units activated when the intensity of stimulation increases?
The increase in the number of motor units activated when the intensity of stimulation increases is called recruitment. It allows the body to generate more force by involving additional motor units to contract muscle fibers.
What does recruitment and frequency of stimulation affect?
Recruitment affects the number of motor units activated in a muscle, while frequency of stimulation affects the force generated by those motor units. Increasing recruitment leads to more muscle fibers being recruited, increasing force production, while increasing frequency of stimulation produces stronger muscle contractions by increasing the rate at which motor units are activated.
The strongest muscle contractions are normally achieved by what?
The strongest muscle contractions are normally achieved by large, fast-twitch muscles such as the quadriceps in the thighs or the gluteus maximus in the buttocks. These muscles are optimized for generating high levels of force quickly.
