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The heartbeat is said to be myogenic because it contracts without having to be stimulated by a nerve. However the contractions are controlled by the pacemaker, located in the wall between the left and right atrium. During exercise there is a rise in carbon dioxide levels detected by the medulla in the brain which sends brain impulses causing the SA node to intricate contractions of the atria and causing the AV node to contract the ventricles. This allows the pacemaker to send messages, through Purkinje fibers, to speed up the heart contractions during exercise and pump more blood through the body. When exercise has stopped, the pacemaker sends messages to slow down the heart rate, decreasing the level of carbon dioxide and therefore pumping less blood through the body. The pacemaker also secretes the hormone adrenaline which causes the pacemaker to speed up the contractions to prepare the body for a fight or flight situation.
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Function of the extrinsic muscles of the eye?
The extrinsic muscles of the eye control the movement of the eyeball and enable eye movements, such as looking up, down, and sideways. These muscles work together to coordinate eye movements and allow us to track objects and focus on different points in our visual field.
Which extrinsic eye muscle originates from the sphenoid bone?
The extrinsic eye muscle that originates from the sphenoid bone is the superior rectus muscle. This muscle is responsible for elevating the eye and helps in adduction and intorsion. It is one of the six extraocular muscles that control eye movements.
Why mass is an example of extrinsic property?
Mass is an example of an extrinsic property, because an extrinsic property is one that varies with and depends on the size and amount of the sample. Obviously, the more of the sample you have, the greater will be the mass. Thus, mass is an extrinsic property. Compare this to density. It doesn't matter how much of the sample you have, the density will be the same. Density is an intrinsic property.
What is the example of intrinsic and extrinsic properties?
density
What automatic unconscious activities the brain control?
The brain controls automatic unconscious activities such as heartbeat, breathing, digestion, and reflex responses. These functions are regulated by different parts of the brainstem and other structures in the brain that work involuntarily without conscious effort.
What is an example of an extrinsic reward from work?
Extrinsic rewards include monetary compensation, promotion, and tangible benefits.
What control heartbeat and breathing?
the blood control everything..
What is meant by extrinsic control?
Extrinsic control refers to the regulation of a system or process by external factors rather than internal mechanisms. In biological contexts, it often describes how external signals, such as hormones or neurotransmitters, influence physiological functions or behaviors. This concept contrasts with intrinsic control, where regulation occurs through internal pathways or feedback systems. Overall, extrinsic control highlights the importance of environmental influences on an organism's functioning.
How do extrinsic eye muscles differ in action from the instrintic eye muscles?
Extrinsic eye muscles move the eyeball in relation to the rest of the body, whereas intrinsic muscles move structures within the eyeball.A: The extrinsic muscles control the movement of the eyes.The extrinsic muscles are controlled by the somatic nervous system(voluntary) The intrinsicmuscles control the lens and pupil. The intrinsiceye muscles, (including the iris sphincter, radial pupilodilator muscles and the ciliarymuscle), are under the control of the autonomic nervous system(involuntary)
What two organ systems are involved in the extrinsic control of the heart?
The nervous and endocrine system.
What extrinsic eye muscles control the movement of the eyes during convergence reflex?
Medial Rectus
The extrinsic muscles of the hand originate where?
The extrensic muscles of the hand originate from the lateral epicondyle of the humerous
Which part of the brain of humans control heartbeat?
medulla
Is miscibility a extrinsic or intrinsic?
Extrinsic
An extrinsic motivator?
An extrinsic motivator
Which is a good conductor (Extrinsic or Intrinsic)?
Extrinsic
How do giraffes require energy?
For movement, respiration and to control the heartbeat
