This preview shows page 1. Sign up to view the full content.
Unformatted text preview: ic dilation increase blood decrease blood CV regulation during emotional stress
4. $ activity of the vagal
nerve and # activity of
(Nor) to the heart
! # heart rate and
contractility 5. # sympathetic outflow to
the capacitance vessels
! constriction (! # EDV) 6. # sympathetic outflow to
the renal and splanchnic
norepinerphrine doesn't play direct role on blood
vessel constriction, epinephrine can cuase
constriction and dilation increase blood decrease blood Phys 312 - Lecture Outline
(A) Response to high BP !
(B) Response to a fall in BP !
CV regulation during emotional stress !
CV regulation during exercise
$ Fight or Flight situations CV regulation during exercise
Mechanical muscle pump --> pump
Humoral CV regulation during exercise
1. Local: CO2, lactic acid, H+, K+, inc metabolite Resistance vessels
dilate in the active
muscles due to
(A very powerful mech)
These products also
on the muscle vessels.
(recall SNS is trying to
we don't want to constrict, we want to dilate
metablite block vasocontrictor CV regulation during exercise
exercise the “Muscle
pump” returns blood
from the lower limbs to
the central circulation. ! # venous return
! # EDV
! # SV
! # CO
! # MAP CV regulation during exercise
3. Nervous System:
# sympathetic outflow to
the heart and systemic
$ vagal outflow to the heart
decreases (not s...
View Full Document
- Fall '12